The Georgia Boot Men's Carbo-Tec FLX 11" Waterproof Pull On Work Boots attach the EVA midsole, extra-wide fiberglass Shovel Shank XL, and rubber outsole to the upper through flexible cement construction. This non-metallic boot meets ASTM F2892 electrical hazard standards, with a Carbo-Tec outsole that resists oil, slip, abrasion, chemical, and heat.