Memory Foam Kidz Twin-Size 8-Inch Memory Foam Youth Mattress with Waterproof Cover, Lavender 100-percent visco elastic memory foam twin-size mattress. 8-Inch thick mattress with waterproof cover. Luxuriously soft yet supportive. Hypoallergenic, mite-proof, anti-microbial. Complies to flammability standard CFR 1633.