Oiled Waterproof Nubuck Leather + Abrasion-Resistant Ripstop Textile; 200g Primaloft BIO, B-DRY Waterproof Membrane, 100% RPET Repreve Laces, 100% RPET Webbing REPREVE: contains recycled materials helping to lighten impact on the planet 200 gram PrimaLoft BIO insulation. PrimaLoft has set sustainability forward with the first-ever biodegradable, 100% recycled synthetic fiber, for insulation and fabric applications. Vibram outsoles: Innovative Technology specifically engineered and designed to perform on wet ice Upper: Oiled Waterproof Nubuck Leather & Abrasion-Resistant Ripstop Textile From the inside out -200g of PrimaLoft Bio insulation and a B-DRY waterproof membrane -the Sphinx Mid is at home in ice-laden mountain towns. Featuring waterproof oiled nubuck leather, recycled components, and a Vibram Arctic Grip A.T. sole made of Vibram XS Trek.