Experience the most restful night's sleep possible with the Dual Layer 2-inch Memory Foam Mattress Topper. Dual layers of support with a firm blue support layer and a softer white support layer Exclusive sleep system uses sleep air columns so the foam and body can exchange air more efficiently Unique design provides ventilation and even distribution of body heat Sleep air columns help the foam mold to the body more effectively Split for queen, king, and Cal king sizes into two sections vertically down the middle Full and twin sizes are a single piece Reversible for custom support between two sleepers on the same bed Dimensions: Twin: 38 x 79 in. Full: 54 x 74 in. Queen: 60 x 79 in. King: 76 x 79 in. Cal king: 71 x 83 in.