Twin XL cooling mattress. This is a temperpedic type mattress with a cooling gel. Purchased at Denver Mattress for $1300.00 Well cared for in very good shape, no stains or tears. Hubs wanted an old fashion spring coil mattress so dont need this one.Works with adjustable bed setup. No box spring or platform, mattress only.Dimensions : 38 wide, 76 long, 13 deep