Black Walnut Oil-Tanned Leather. Construction: Goodyear Storm Welt. Lining: Comfort Weave Vamp. Insole: Removable Polyurethane Footbed on Poron Comfort Cushion. Midsole: Rubber. Shank: Engineered Composite. Outsole: Single-density Polyurethane MAXWear Sole with 90° Heel. Special Features: ASTM F2413-11 M/I/75/C/75, Steel Toe, EH Rated, Tested For and Meets CAN/CSA-Z195 18,000 Volts Electric Shock Resistance Standard.