1/2" thick for when comfort and insulation are a priority. Our Alpine Pads are constructed from a special blend of foams to give superior comfort and insulation with minimum weight. The Alpine Pads are 100% waterproof, unaffected by UV light and flexible to -45OF. Packaged in poly sleeve with insert. Dimensions: 1/2" x 20" x 54"Packed Size: 20" x 6 3/8"R-Value: 2Type: FoamWeight: 9.92 oz.