Founded by Leo Koltin in 1946, Kolcraft originally made play yards. Over time, the company expanded to sell crib mattresses, baby strollers, activity centers, baby walkers, and other baby products. Kolcraft partners with Sealy to manufacture crib mattresses and partners with bran ... Read More ds such as Jeep, Sesame Street, and Contours to produce different children's products. The company today is mainly known for its crib mattresses and strollers. The Pure Sleep Therapeutic crib mattress, with 80 heavy-gauge steel coils to provide firm support, helps a baby sleep all through the night. It has a nonallergenic sleeping surface and a Perma-Dri waterproof cover that's easy to clean with a damp cloth. The mattress also fits standard toddler bed frames and cribs.