Oiled Leather. Soft Moisture Wicking Nylon Lining. Non-Removable Cushion Insole. Tempered Steel Shank. Goodyear Welt Construction. Lightweight High Abrasion Polyurethane Outsole. Steel Toe meets ASTM I75/C75 Standards F24713-05. Electrical Hazard meets ASTM Standards F2413-05.