Goodyear Welt Construction. Thorogood's Exclusive Oil and Slip Resistant "Black 90" Polyurethane Comfort Outsole. Cotton Drill Vamp Lining. Removable Dual Density Ultimate Shock Absorption Insert on Poron 4000 Comfort Cushion. Rubber Midsole. Engineered Composite Shank. Waterproof Barrier. 400 Grams of Thinsulate Insulation. Soft Toe.