The perfect wellington work boots for a day on the farm or ranch SPR leather upper protects against caustic alkali, sulfuric acid, calcium hydroxide, potassium phosphate and caustic potash Approx. 15 inch circumference Goodyear welt construction Flex-notched quarters Proprietary chemical and oil resistant polyurethane wedge outsole ASTM F2413 protective toe classification ASTM F2413 electrical hazard standard Georgia Boot Men's 10 Inch ST Wellington Wedge