This men's boot has SPR (SPR leather resists caustic alkali, sulfuric acid, calcium hydroxide, potassium phosphate, caustic potash, and other barnyard acids. It's also pasture-proof) leather that is specially tanned to make it stronger and more abrasion-resistant than other leathers used in footwear. And this leather resists organic acids and chemicals. Another feature you'll like is the proprietary Georgia Boot dual-density polyurethane Wedge outsole that gives this boot a comfortable base. The comfortable boot has a TDC (Technology Driven Comfort) polyurethane insole. It also offers a steel shank for arch support and an EVA midsole. The boot collar and tongue are padded with full-grain pig leather. The wedge boot has quality milled nickel hardware. Material: Leather.