Our new 3" MyPillow® Mattress Topper is made up of 3 unique layers Layer 1 - MyPillow® patented foam, in a solid piece, provides superior support and durability Layer 2 - Transitional foam provides optimal comfort, evenly distributes body weight and helps relieve pressure points Layer 3 - Cover made from Phase Change Material to keep your body temperature regulated throughout the night Other MyPillow Mattress Topper Facts Zippered Removable Cover is washable and dryable Four corner straps to hold your topper in place No wires, remotes or moving parts