Vivon iCoil 8 Inch Spring & Foam Hybrid Mattress, Twin Comforting Poly Jacquard Fiber Quilted Cover 1 inch layer of Comfort Foam, 7.5 inches iCoil support base Ideal for back and stomach sleepers and individuals seeking a medium-firm sleep surface CertiPUR-US certified foam Our patented compression technology allows our mattresses to be compressed, rolled and shipped in a box via FedEx/UPS