4.5″ THICK BAMBOO FABRIC ANTI SLIP BACK ZIPPERED CASE COMFORTABLE – This folding mattress is plush, soft, breathable, and super comfortable. PORTABLE – This mattress folds easily for travel or storage and is perfect for small apartments and tight spaces. CONVENIENT – The removable bamboo cover is machine washable for easy care. DURABLE – Built to last and made of 4.5” thick luxe CertiPur certified foam that won’t lose it’s shape.