Mlily Serenity Gel Infused Memory Foam Twin XL Mattress 7.5 inches of higher resiliency base foam and Contour9 with hip and shoulder regions 3.0 inches of M36 memory foam and Contour9 with hip and shoulder regions 2.0 inches of M48 high density memory foam in the pillow top for cloud-like comfort 0.5 inches of bamboo infused memory foam quilted ino the premium cover