Description of Insul-Mat AO Mtn Regular Sleeping Pad This new 4 season self inflating sleeping pad redesign has its roots in the MaxMtn series of yesteryear, with an air-core twist. The new air-core tubes keep you on the pad while complementing the weight shaving mummy shape. This pad sleeps like its 25" wide, but carries like a feather. Features: Bermed Air-loft Thermo side rails Weight shaving lightweight foam Strategic drill / die-cut combo brings high insulation to weight ratio Sleeping bag like mummy shape 50D DRS all terrain durability Sticky - S print Dimensions: 20 x 48 x 1.5in. (51 x 122 x 3.8cm) Weight: 18oz (510 g.)