Sleep Master 8-Inch Dale Earnhardt Jr. Impact Gel Memory Foam Mattress, Twin Dale Earnhardt Jr. #88 comfort cover Impact gel surface with 1.5 inch memory foam layer, 2 inch of comfort curve HD foam layer and 4.5 inch of high density foam The foams are infused with Green Tea, Charcoal, and Natural Seed Oil which minimizes the use of petrol based chemical oils and works to eliminate odors. Our patented compression technology allows our mattresses to be compressed, rolled and shipped in a box via Fedx. All foam is CertiPUR-US Certified for durability, performance, and content.