KEEN Utility Men's Durham AT ESD Work Boot 100% Leather/Synthetic Made in the USA or Imported Rubber sole Left and right asymmetrical aluminum toes Electro static dissipative (ESD) footwear is constructed to reduce excess static electricity thermoplastic polyurethane shank for midfoot support Removable metatomical dual density ethylene vinyl acetate footbed Pu midsole for long-lasting comfort