Cover: 100% waterproof polyester +non-slip bottom ; filling:100% Polyurethane（22D）High-density memory foam provides a soft touch to kids while also firm enough to prevent them from falling off the bed.Waterproof and washable cover with silicone beaded non-skid fabric stays firmly in place.Bedrails are hypoallergenic, non-toxic, PHTHALATE & BPA Free. Safer and More Comfortable for Your Sleeping ChildDimension: 52" x 7" x 4.5". Perfect height and ideally sized to allow ample room for your little one to stretch out while sleeping. Our bumpers fit toddler beds, twin, full, double, queen and king beds. Do NOT use on top bunks or loft beds.