Exped SynMat Hyperlite Sleeping Pad Top Material: 20 D Polyester, TPU Polyether Film Laminate, Hydrolysis resistant, Honeycomb embossed Bottom Material: 20 D Polyester, TPU Polyether Film Laminate, Hydrolysis resistant Insulation: Texpedloft Microfibre Temperature: 21.2 F R-Value: 3.30