Kid's Life Crackerjack Twin Mattress by Serta, is designed to provide pressure-relieving comfort that reduces disruptive tossing and turning. Featuring a foam support core in place of a traditional innerspring, which works to provide proper support throughout the night, and a layer of Serta's PillowSoft™ Foam that gently contours the body. This mattress provides enhanced cushioning for your child's best night's sleep.