Full Grain Oil-Tanned Leather. Construction: Cement. Lining: Heavy Duty Nylex. Insole: Removable Polyurethane Ultimate SD Footbed. Midsole: Compression Molded EVA with Impact 300 Gel Heel Insert. Shank: Engineered Composite. Outsole: A.S.R. Super Slip Resisting Rubber. Special Features: 100% Non-Metallic.