The Thermarest NeoAir XTherm represents the pinnacle of cold-weather sleep systems, offering an industry-leading warmth-to-weight ratio for alpinists and winter backpackers. This latest iteration features the WingLock Valve for three-times faster inflation and deflation. The rectangular 'MAX' shape provides extra coverage and comfort for larger frames or those who move frequently in their sleep. It utilizes the patented Triangular Core Matrix and ThermaCapture technology to achieve a 7.3 R-value. Technical Specifications: Weight: 680g (1 lb 8 oz). Dimensions: 64 x 196 cm (25 x 77 in). Thickness: 7.6 cm (3 in). Material: 30D Rip Nylon (Top), 70D Nylon (Bottom). R-Value: 7.3. Packed size: 28 cm x 13 cm.