Pull on and go as quickly as winter days fly by. From the inside out-200g of Primaloft Bio(TM) insulation and B-DRY waterproofing-the Sphinx Pull-On is ready for ice-laden mountain towns. Featuring waterproof oiled nubuck, a water-resistant medial zipper, recycled components, and a Vibram Arctic Grip A.T. sole made of Vibram XS Trek. *This style runs small. Please order up a half size. Width Standard - Women&';s standard width is B in the heel and C in the forefoot (according to Brannock DeviceA(R)). Patterns and materials in a given model may influence fit. We always recommend trying our footwear on to ensure the best possible fit. Volume Standard - Medium-High volume feet tend to be wider with higher arches and insteps. Upper Material Oiled Waterproof Nubuck Leather + Abrasion-Resistant Ripstop Textile 200g Primaloft BIO B-DRY Waterproof Membrane 100% RPET Webbing + YKK Water-Resistant Medial Zipper Weight 15.3 oz./434 grams