The North Face - Lifty 400 GTX (Brownie/Stone) - Men's: GORE-TEX waterproof breathable membrane. Double-adhesive latex seam-sealed construction. 400g. PrimaLoft insulation that's warmer for your feet, wet or dry. Non-hydrolysis waterproof synthetic Nubuck leather upper. Waterproof bomber textile. Dri-Lex fleece lining in the collar and tongue. D-Ring gaiter attachments. AgION anti-microbial X-2 footbed. Injection-molded nylon shank insert. Dual-density X-2 footbed. CM EVA midsole. TNF Winter Grip rubber outsole consists of a softer, tackier rubber compound designed specifically to provide ample traction in the wettest and slickest weather conditions. Comfort range: -40F/-40C.