Waterproof Leather upper with Warm GORTEX lining. Sturdy and Flexible Goodyear Welt Construction. C.S.A. Grade 1 Approved, E.S.R. Rated. Oil and Slip Resistant Wolverine W88 Rubber outsole. Lightweight Polyurethane Midsole. Composite Toe with Flexible Wellman Flex 5 Fabric Plate. 400 gms Thinsulate Insulation an efficient way to keep your feet warm and dry.