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Giro Bicycle Helmets

Giro
$40.00 at REI

Kids don't think twice about fit systems and tech specs--they just want to ride! The Giro Rascal bike helmet has an easy fit syste...m that allows your little rider to be on his or her way quickly. Read More

REI
Giro
$130.00 at REI

Built for off-trail riding but with the lightweight and streamlined design of a road cycling helmet, the Giro XaraTM is a top choi...ce for women looking for maximum protection and performance. Read More

REI
Giro
$45.00 at REI

A lightweight, very tough bike helmet for kids, the Giro Raze keeps things cool with lots of vents and dials in the perfect fit fo...r safety. Read More

REI
Giro
$200.00 at REI

Featuring a mount for a P.O.V. camera, a lightweight fiberglass shell and lots of vents for cooling, the Giro Cipher Bike Helmet i...s built to excel in a new era of trail riding. Read More

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Giro
$150.00 at REI

Thanks to a clever internal reinforcement structure, the Fathom offers outstanding ventilation for aggressive climbs while preserv...ing reliable Giro protection for your most rugged singletrack rides. Read More

REI
Giro
$130.00 at REI

The Giro Xar bike helmet is tough, stylish and, best of all, fantastically ventilated for cool comfort when you crank it up on the... trail. Read More

REI
Giro
$30.00 $18.95 at Sierra Trading Post

Get your young one off to a safe start on two wheels with the Giro Rodeo bike helmet, featuring Universal Fit sizing and the easy-...to-use AcuDial fit system. Available Colors: MOUNTAIN BLACK/TITANIUM SKULLS, PINK PRINCESS, TURQUOISE/MAGENTA/FLOWER SKETCH, BLUE PAINTERS, BLACK/TI SKULLS, MATTE BLUE, PINK. Sizes: O/S. Read More

Giro
$90.00 at REI

Built for demanding trail rides, the Giro Hex bike helmet adjusts easily and quickly for a perfect fit, and offers plenty of cooli...ng airflow to ensure you're comfortable as you're shredding. Read More

REI
Giro
$75.00 at REI

A low-profile mountain bike helmet, the Giro Phase is cool, durable and designed to offer protection for daunting climbs and rock-...strewn ribbons of singletrack. Read More

REI
Giro
$75.00 at REI

A low-profile mountain bike helmet, the Giro Phase is cool, durable and designed to offer protection for daunting climbs and rock-...strewn ribbons of singletrack. Read More

REI
Giro
$130.00 at REI

The Giro Xar bike helmet is tough, stylish and, best of all, fantastically ventilated for cool comfort when you crank it up on the... trail. Read More

REI
Giro
$150.00 at REI

After years of watching a wide range of athletes buy its beloved Atmos road helmet for off-road racing, Giro decided to go ahead a...nd design a mountain-ready version of the new Atmos II, and so created the Giro Fathom Helmet. A structural clone of the Atmos II, boasting the new Thermoformed SL Roll Cage, the Fathom gets its own styling and a removable visor, making it just that much more ready to hit the trail. The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three. In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride. Read More

REI
Giro
$130.00 at REI

The Giro Xar bike helmet is tough, stylish and, best of all, fantastically ventilated for cool comfort when you crank it up on the... trail. Read More

REI
Giro
$150.00 at REI

After years of watching a wide range of athletes buy its beloved Atmos road helmet for off-road racing, Giro decided to go ahead a...nd design a mountain-ready version of the new Atmos II, and so created the Giro Fathom Helmet. A structural clone of the Atmos II, boasting the new Thermoformed SL Roll Cage, the Fathom gets its own styling and a removable visor, making it just that much more ready to hit the trail. The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three. In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride. Read More

REI
Giro
$96.93 at REI

Brand: Giro. Product Style: Giro Xar Helmet - Matte Black/Gray Bars - Small - S13. The XAR offers all the features you’ve co...me to expect from Giro’s top-level trail-riding helmets—P.O.V. adjustable visor; In-mold composition with EPS foam and polycarbonate shell; Roll Cage reinforcement—but the XAR heralds a new era of performance, comfort and style. At the heart of this helmet you’ll find 17 Wind Tunnel vents as well as optimized internal channeling, and the visor is vented to increase airflow. Breathability on the XAR is incredible; there’s never been a lid this breathable on dirt. Even the padding is extraordinary thanks in part to X-Static fabric. Read More

REI
Giro
$90.00 at REI

Hit the trail without worrying about your lid. The Giro Hex Helmet handles all the cranium-protecting duties and lets you focus on... riding. The new RocLoc 5 adjustment system allows for simple horizontal and vertical adjustment without taking the helmet off, so you can get it dialed quickly and get pedaling. The adjustable visor helps keep the sun ot of your eyes, and 21 vents keep your brain from overheating on the climbs. Read More

REI
Giro
$96.93 at REI

THE CZAR OF ALL-MOUNTAINAll-mountain riding demands gear that is versatile, lightweight without sacrificing durability, and comfor...table enough to ride for four to five hours in varying conditions. So we developed the Xar specifically for aggressive trail riding, with features like 17 Wind Tunnel vents with internal airflow channels, the micro-adjustability of Roc Loc(R) 5 and our patented P.O.V. visor to deflect the sun, rain, brush and branches. If youre riding bigger, faster and farther than ever, the Xar is fit to roll with you. Read More

REI
Giro
$96.93 at REI

THE CZAR OF ALL-MOUNTAINAll-mountain riding demands gear that is versatile, lightweight without sacrificing durability, and comfor...table enough to ride for four to five hours in varying conditions. So we developed the Xar specifically for aggressive trail riding, with features like 17 Wind Tunnel vents with internal airflow channels, the micro-adjustability of Roc Loc(R) 5 and our patented P.O.V. visor to deflect the sun, rain, brush and branches. If youre riding bigger, faster and farther than ever, the Xar is fit to roll with you. Read More

REI
Giro
$75.00 at REI

First and foremost, a mountain bike helmet should be comfortable and durable. The Phase is true to the corelight, cool and durable... enough to handle even the most daunting climbs and rock-strewn ribbons of singletrack. With the easy fit and adjustability of Roc Loc(R) 5 and the comfort of Super Fit sizing, its a top performer for riders looking for a low-profile helmet at a great price. Read More

REI
Giro
$90.00 at REI

The Hex fuses a muscular, progressive style with the versatility of a trail riding helmet. Its stocked with all the features you n...eed for the mountain, including the sure comfort and stability of Roc Loc 5 and tool-free adjustment of our P.O.V. visor. Many riders swear its the best all-mountain helmet for the money, hands-down.SUPER FIT(TM) SIZES:S 20-21.75 / 51-55 cmM 21.75-23.25 / 55-59 cmL 23.25-24.75 / 59-63 cmWEIGHT: 315g Read More

REI
Giro
$200.00 at REI

The demands of freeride and enduro are pretty similar, and those parameters are what Giro set out to fulfill with the Cipher Helme...t. The lightweight, fiberglass shell provides the strength and protection your melon needs, without producing a fatiguing pendulum effect on extended descents. That shell is molded with channeled ventilation at the browline to get the most airflow without any sacrifice to structural integrity. On the interior, plush padding is anti-static and anti-microbial, and furthering that, they can be removed to wash. For visibility, the visor is adjustable without tools, and custom-injected gaskets around the port ensure excellent field of vision. On the tech side of things, Giro's made sure the Cipher's ready for your needs. This includes an integrated P. O. V. camera mount plus built-in, TuneUps speaker pockets for ear buds. The Giro Cipher Helmet comes in sizes Small through X-Large and five colors. Read More

REI
Giro
$66.93 at REI

The Hex fuses a muscular, progressive style with the versatility of a trail riding helmet. Its stocked with all the features you n...eed for the mountain, including the sure comfort and stability of Roc Loc(R) 5 and tool-free adjustment of our P.O.V. visor. Many riders swear its the best all-mountain helmet for the money, hands-down.SUPER FIT(TM) SIZES:S 20-21.75 / 51-55 cmM 21.75-23.25 / 55-59 cmL 23.25-24.75 / 59-63 cmWEIGHT: 315g Read More

REI
Giro
$149.93 at REI

STEP IT UP ON THE WAY DOWNThe all-new Cipher is built around the demands of freeride and enduro, with a lightweight fiberglass she...ll, plush interior padding, and vented brow ports for unrivaled cooling and comfort. Vinyl Nitrile padding along the jaw line enhances impact management in this critical area, and the integrated P.O.V. camera mount plus built-in speaker pockets let you dial in your sound and images. Altogether its a new level of performance, for a new era of trail riding.FEATURES:Integrated P.O.V. camera mount; Tool-free, bolt-on visor; Channeled ventilation at browline; Emergency removable pads; X-Static(R) anti-microbial padding; D-Ring buckle system; TuneUps audio speaker pockets with O-Snap cord management; Replacement cheek p Read More

REI
Giro
$130.00 at REI

More than enough for casual riding, the Giro Xara helmet is ready to hit the trail and protect you while it's at it. Made with Gir...o's In-Mold technology, it's one of the lightest, but strongest, out there. The In-Mold construction process fuses the outer shell to an EPS foam liner. This process enhances the effectiveness of both parts. In fact, the fusion process actually reinforces those formerly vulnerable spots around the vents and ribs. It makes them lighter, more durable, and better ventilated than helmets with shells that are glued to the liner. This process safely creates 17 Wind Tunnel vents with internal channeling. The Xara also gets the benefit of a P. O. V. visor to deflect the sun, rain, and twigs. The visor has a patented internal clutch system that allows for 15 degrees of vertical adjustment without the need for any tools; just give it a quick whack with your hand. And, if you'd rather not have it on at all, you can easily remove it without tools. Giro's development of the Roc Loc 5 Fit System makes it possible to micro-adjust your helmet on the fly, with just one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers: it is almost 40% lighter than comparable systems. But, that's only one benefit of Roc Loc -- it's also adjustable vertically as well as horizontally for an excellent fit. Read More

REI
Giro
$200.00 at REI

The demands of freeride and enduro are pretty similar, and those parameters are what Giro set out to fulfill with the Cipher Helme...t. The lightweight, fiberglass shell provides the strength and protection your melon needs, without producing a fatiguing pendulum effect on extended descents. That shell is molded with channeled ventilation at the browline to get the most airflow without any sacrifice to structural integrity. On the interior, plush padding is anti-static and anti-microbial, and furthering that, they can be removed to wash. For visibility, the visor is adjustable without tools, and custom-injected gaskets around the port ensure excellent field of vision. On the tech side of things, Giro's made sure the Cipher's ready for your needs. This includes an integrated P. O. V. camera mount plus built-in, TuneUps speaker pockets for ear buds. The Giro Cipher Helmet comes in sizes Small through X-Large and five colors. Read More

REI
Giro
$55.93 at REI

First and foremost, a mountain bike helmet should be comfortable and durable. The Phase is true to the corelight, cool and durable... enough to handle even the most daunting climbs and rock-strewn ribbons of singletrack. With the easy fit and adjustability of Roc Loc(R) 5 and the comfort of Super Fit sizing, its a top performer for riders looking for a low-profile helmet at a great price. Read More

REI
Giro
$150.00 at REI

After years of watching a wide range of athletes buy its beloved Atmos road helmet for off-road racing, Giro decided to go ahead a...nd design a mountain-ready version of the new Atmos II, and so created the Giro Fathom Helmet. A structural clone of the Atmos II, boasting the new Thermoformed SL Roll Cage, the Fathom gets its own styling and a removable visor, making it just that much more ready to hit the trail. The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three. In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride. Read More

REI
Giro
$90.00 at REI

Hit the trail without worrying about your lid. The Giro Hex Helmet handles all the cranium-protecting duties and lets you focus on... riding. The new RocLoc 5 adjustment system allows for simple horizontal and vertical adjustment without taking the helmet off, so you can get it dialed quickly and get pedaling. The adjustable visor helps keep the sun ot of your eyes, and 21 vents keep your brain from overheating on the climbs. Read More

REI
Giro
$90.00 at REI

The Hex fuses a muscular, progressive style with the versatility of a trail riding helmet. Its stocked with all the features you n...eed for the mountain, including the sure comfort and stability of Roc Loc(R) 5 and tool-free adjustment of our P.O.V. visor. Many riders swear its the best all-mountain helmet for the money, hands-down.SUPER FIT(TM) SIZES:S 20-21.75 / 51-55 cmM 21.75-23.25 / 55-59 cmL 23.25-24.75 / 59-63 cmWEIGHT: 315g Read More

REI
Giro
$130.00 at REI

The Giro Xar bike helmet is tough, stylish and, best of all, fantastically ventilated for cool comfort when you crank it up on the... trail. Read More

REI
Giro
$55.93 at REI

First and foremost, a mountain bike helmet should be comfortable and durable. The Phase is true to the corelight, cool and durable... enough to handle even the most daunting climbs and rock-strewn ribbons of singletrack. With the easy fit and adjustability of Roc Loc(R) 5 and the comfort of Super Fit sizing, its a top performer for riders looking for a low-profile helmet at a great price. Read More

REI
Giro
$75.00 at REI

A low-profile mountain bike helmet, the Giro Phase is cool, durable and designed to offer protection for daunting climbs and rock-...strewn ribbons of singletrack. Read More

REI
Giro
$96.93 at REI

THE CZAR OF ALL-MOUNTAINAll-mountain riding demands gear that is versatile, lightweight without sacrificing durability, and comfor...table enough to ride for four to five hours in varying conditions. So we developed the Xar specifically for aggressive trail riding, with features like 17 Wind Tunnel vents with internal airflow channels, the micro-adjustability of Roc Loc 5 and our patented P.O.V. visor to deflect the sun, rain, brush and branches. If youre riding bigger, faster and farther than ever, the Xar is fit to roll with you. Read More

REI
Giro
$130.00 at REI

Built for off-trail riding but with the lightweight and streamlined design of a road cycling helmet, the Giro XaraTM is a top choi...ce for women looking for maximum protection and performance. Read More

REI
Giro
$96.93 at REI

It's not that road helmets are substantially less durable than helmets made for mountain biking, it's just that the three-way bala...nce between ventilation, weight, and durability is readjusted for off-road purposes. The Giro Xar Helmet gets the same expert engineering found in the top-line road helmets. That means the same In-Mold process that make Giro road helmets some of the strongest and lightest on the market is also used for the Xar. The In-Mold construction process fuses the outer shell to the EPS foam liner. This process enhances the effectiveness of both parts. In fact, the fusion process actually reinforces those formerly vulnerable spots around the vents and ribs. It makes them lighter, more durable, and better ventilated than helmets with shells that are glued to the liner. Where the Xar differs slightly from the road helmets is in the focus placed on the ventilation. With 17 Wind Tunnel vents and internal channeling, Giro has hardly skimped on ventilation, it's just that by reducing the number and size of the vents, slightly more emphasis has been put on durability. You'll also have the benefit of the P. O. V. visor to deflect the sun, rain, and twigs. The visor has a patented internal clutch system that allows for 15 degrees of vertical adjustment without the need for any tools; just give it a quick whack with your hand. And if you'd rather not have it on at all, you can easily remove it without tools. Giro's development of the Roc Loc 5 Fit System makes it possible micro-adjust your helmet on the fly, with just one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers: it is almost 40% lighter than comparable systems. The Giro Xar Helmet comes in Small, Medium and Large. It is available in Matte Black/Grey Bars, Matte White/Grey Bars and Black/Cyan/Lime. Read More

REI
Giro
$150.00 at REI

After years of watching a wide range of athletes buy its beloved Atmos road helmet for off-road racing, Giro decided to go ahead a...nd design a mountain-ready version of the new Atmos II, and so created the Giro Fathom Helmet. A structural clone of the Atmos II, boasting the new Thermoformed SL Roll Cage, the Fathom gets its own styling and a removable visor, making it just that much more ready to hit the trail. The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three. In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride. Read More

REI
Giro
$66.93 at REI

Brand: Giro. Product Style: Giro Hex Helmet - Matte White Lines - Small - S13. The Hex fuses a muscular, progressive style with th...e versatility you need for aggressive trail riding. It’s a great choice for price-conscious riders looking for a rugged all-mountain helmet that offers loads of premium features. Read More

REI
Giro
$150.00 at REI

After years of watching a wide range of athletes buy its beloved Atmos road helmet for off-road racing, Giro decided to go ahead a...nd design a mountain-ready version of the new Atmos II, and so created the Giro Fathom Helmet. A structural clone of the Atmos II, boasting the new Thermoformed SL Roll Cage, the Fathom gets its own styling and a removable visor, making it just that much more ready to hit the trail. The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three. In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride. Read More

REI
Giro
$130.00 at REI

The Giro Xar bike helmet is tough, stylish and, best of all, fantastically ventilated for cool comfort when you crank it up on the... trail. Read More

REI
Giro
$96.93 at REI

THE CZAR OF ALL-MOUNTAINAll-mountain riding demands gear that is versatile, lightweight without sacrificing durability, and comfor...table enough to ride for four to five hours in varying conditions. So we developed the Xar specifically for aggressive trail riding, with features like 17 Wind Tunnel vents with internal airflow channels, the micro-adjustability of Roc Loc(R) 5 and our patented P.O.V. visor to deflect the sun, rain, brush and branches. If youre riding bigger, faster and farther than ever, the Xar is fit to roll with you. Read More

REI
Giro
$66.93 at REI

Hit the trail without worrying about your lid. The Giro Hex Helmet handles all the cranium-protecting duties and lets you focus on... riding. The new RocLoc 5 adjustment system allows for simple horizontal and vertical adjustment without taking the helmet off, so you can get it dialed quickly and get pedaling. The adjustable visor helps keep the sun ot of your eyes, and 21 vents keep your brain from overheating on the climbs. Read More

REI
Giro
$96.93 at REI

THE CZAR OF ALL-MOUNTAINAll-mountain riding demands gear that is versatile, lightweight without sacrificing durability, and comfor...table enough to ride for four to five hours in varying conditions. So we developed the Xar specifically for aggressive trail riding, with features like 17 Wind Tunnel vents with internal airflow channels, the micro-adjustability of Roc Loc(R) 5 and our patented P.O.V. visor to deflect the sun, rain, brush and branches. If youre riding bigger, faster and farther than ever, the Xar is fit to roll with you. Read More

REI
Giro
$150.00 at REI

After years of watching a wide range of athletes buy its beloved Atmos road helmet for off-road racing, Giro decided to go ahead a...nd design a mountain-ready version of the new Atmos II, and so created the Giro Fathom Helmet. A structural clone of the Atmos II, boasting the new Thermoformed SL Roll Cage, the Fathom gets its own styling and a removable visor, making it just that much more ready to hit the trail. The SL Roll Cage is the skeleton that gives form to the helmet's EPS liner. It keeps the helmet together under impact, acting like a second shell to maintain the helmet's structural integrity and disperse impact. The added strength also means that Giro can add negative space to the Atmos II without sacrificing safety, so it's more ventilated and lighter than its predecessor. The Atmos II still takes advantage of Giro's In-Mold Composite reinforcement, which permanently fuses the outer shell and SL Roll Cage to the EPS foam liner to enhance the effectiveness of all three. In an age of mass production, Giro's Roc Loc 5 Fit System makes the Atmos II fit like a custom one-off. You can custom tune the fit tension as well as the fore-aft tilt of the helmet in seconds with one hand. Though other helmet manufacturers have similar adjustability options, none of them even come close to the weight savings that the Roc Loc system offers; it's almost 40% lighter than comparable systems. Keeping your head cool during even the hottest, most critical road races is something that Giro has focused a great deal of attention on. Giro helmets are developed with a proprietary Wind Tunnel Ventilation System that combines 26 vents in the shell with exhaust channels within the belly of the helmet leading to the rear. Fresh, cool air from the front is strategically channeled around the head to help evaporate the sweat before exiting through the rear exhaust openings. It's a natural cooling system that you'll appreciate every ride. Read More

REI
Giro
$55.93 at REI

First and foremost, a mountain bike helmet should be comfortable and durable. The Phase is true to the corelight, cool and durable... enough to handle even the most daunting climbs and rock-strewn ribbons of singletrack. With the easy fit and adjustability of Roc Loc(R) 5 and the comfort of Super Fit sizing, its a top performer for riders looking for a low-profile helmet at a great price. Read More

REI
Giro
$55.93 at REI

First and foremost, a mountain bike helmet should be comfortable and durable. The Phase is true to the corelight, cool and durable... enough to handle even the most daunting climbs and rock-strewn ribbons of singletrack. With the easy fit and adjustability of Roc Loc 5 and the comfort of Super Fit sizing, it's a top performer for riders looking for a low-profile helmet at a great price. Read More

REI
Giro
$88.93 at REI

SUPREME COMFORT AND PERFORMANCE FOR ALL-MOUNTAIN RIDINGThe Xara is our premium Womens Series model for off-road riders looking for... a stylish low-profile design with maximum ventilation and great durability. Ready for anything from casual exploring to aggressive trail riding, the Xara keeps you cool and comfortable with 17 Wind Tunnel vents, the micro-adjustability of Roc Loc(R) 5, plus our patented P.O.V. visor that deflects the sun, rain, brush and branches. Read More

REI
Giro
$130.00 at REI

The Giro Xar bike helmet is tough, stylish and, best of all, fantastically ventilated for cool comfort when you crank it up on the... trail. Read More

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