The 7 cm thick Ultra 5R takes advantage of Exped's Synmat series technology: the air compartments are covered with lightweight fabrics and insulated with synthetic fiber. It prevents air from circulating between the points heated by your body and the points cooled by the outside air. The R-value of the pad is a 4.8, making it warm enough for all but the coldest nights. The lowest using temperature recommended by the manufacturer is -20ºC. - M size and tapered Mummy shape: 183 cm long, 52 cm wide at the shoulders and 35 at the feet - Filled with 160g/m² Expedloft synthetic fiber - The surface fabric is a 20 denier ripstop A Schnozzel pump bag is included to fill the pad without the need for blowing. Blowing would draw moisture into the pad and the use of a pump bag reduces fainting.