Signature Sleep Memoir 8 Inch Memory Foam Mattress with CertiPUR-US certified foam, Twin The Signature Sleep Memoir 8 inch mattress is made with a 2" top layer of comfortable Memoir Foam, followed by 6 inches of high density foam; this allows for the mattress to mold to the body's natural shape for a comfortable night's sleep Comfortable, eco-friendly mattress to help minimize pressure on the body, distribute weight evenly and provide balanced support no matter how much you toss and turn The 8 inch Memory Foam mattress ships compressed, rolled, and vacuum sealed in a single box. Please allow up to 72 hours for the mattress to fully expand and for any potential odor to dissipate The Signature Sleep Memoir 8 mattress is made with CertiPUR-US certified foam This Memory Foam mattress includes a soft cover made of breathable knit fabric; it is non-removable