Modern, sleek, and iconic, The North Face Nuptse Purna blends winter technology with contemporary cosmopolitan style. . 200 g PrimaLoft Eco synthetic insulation for warmth to 25degF 32degC. Durable TNF Winter Grip rubber outsole with IcePick temperature sensitive lugs for superior winter traction on snow and ice. Northotic compression molded internal drop in midsolefootbed for cushioned comfort. Cemented and seam sealed waterproof construction. Waterproof velvet suede upper. Waterproof, lightweight, synthetic shell covers the foot. Water resistant, baffled, 100% recycled P.E.T. ripstop cuff detail. Tongue gusset to keep elements out. Faux fur collar detail. Lastfit: Classic, women specific TNF fit with a sleeker last shape for a more feminine look that doesnt compromise comfort and performance. TNF uses BLC British Leather Chemists compliant leather for environmental responsibility.