The Exped SynMat UL 7 Air Pad offers unmatched comfort and warmth at a minimal weight and pack size. Size M weighs only 16.2 oz. at 72 x 20 in. and has a sumptuous 2.8 in. thickness and an excellent R Value of 3.1. All this at the size of a liter bottle. Fabrics are extremely lightweight and compact and are abrasion and puncture resistant. Non slip finish keeps you on the pad. The synthetic microfiber filling is laminated to both upper and lower sides of the mat which eliminates the loss of loft and provides 4 season warmth. Baffled chambers evenly distribute insulation to eliminate cold spots. High frequency welded seams create airtight construction. FlatValve Technology the valves are flat and not on the mat's edge so they do not protrude and are therefore protected and durable. Pad can be inflated by mouth. Stuff sack included. Repair kit included. Thickness: 2.8 in. Size: S 64 in. x 20 in., M 72 in. x 20 in. Weight: S 15.2 oz., M 16.2 oz. Packed Size: S 9 in. x 3.5 in., M 9.4 in. x 3.7 in.