With cutting edge Triangular Core Matrix(TM) construction and ThermaCapture(TM) technology, the XTherm NXT delivers a 7.3 R-value while weighing just 15.5 oz (440 g) in the Regular size. At 3-inches thick, with horizontal baffles, all-night comfort and support are at hand, while 70D nylon on the bottom ensures the XTherm NXT holds up to extended expedition use. The WingLock(TM) Valve allows for rapid inflation and deflation but is also intuitive and easy to use in frigid weather when the gloves are not coming off. Width: 25 inch (both sizes) Length: 72 inches (Regular), 77 inches (Large) Thickness: 3 inches R-Value: 7.3 Fabric: Nylon, Polyurethane