Foam/Metal/Fabric COZY COMFORT: Get great sleep atop this twin size 12 inch mattress covered with a soft knitted fabric top and filled with premium foam over a pocket spring core ideal for all body types and sleep styles FAMILY FRIENDLY: High quality foam is CertiPUR-US Certified for content so you can buy with confidence knowing your indoor air quality will not be compromised and that our mattress is manufactured for safe sleep, durability, and performance