The XTherm NXT impresses with the best warmth-to-weight ratio of any sleeping pad ever designed and is the top choice for mountaineers, backpackers, and weight-conscious adventurers who refuse to be deterred by cold weather. The Triangular Core Matrix construction and ThermaCapture technology achieve an R-value of 7.3 while maintaining low weight and volume. Ultra-lightweight: 439 g (15.5 oz) generates warmth without the extra weight typically required in extreme cold. Premium comfort: exceptionally high support and comfort at 7.5 cm (3 in) thick. Particularly compact packing size: comparable to the volume of a 1-liter bottle. Durable: made from 70D nylon, which is particularly tear-resistant and robust. Easy inflation and deflation: the WingLock valve is easy to operate even in sub-zero temperatures. During inflation, air flows in only one direction, and the large volume of air makes it easier to inflate and deflate.