Approved for flight by the U.S. Air Force and built for comfort and safety, the C790 ST contains both an ASTM certified/EH rated steel toe and a Gore-tex lining that not only makes this boot waterproof, but also petroleum, oil and lubricant (POL) resistant. The lace-to-toe design also allows for a better, customized fit for increased stability and support. VANGUARD running shoe sole construction Steel toe meets ASTM F2412-11 and F2413-11 standards for impact & compression and EH rated Durably waterproof and highly breathable GORE-TEX fabric AR 670-1 Compliant Specifications Height: 8" (Standard Military Height) Upper: Flesh-side out cattlehide leather & nylon fabric Midsole: Highly cushioned, shock absorbent midsole Outsole: 100% rubber VIBRAM Sierra outsole Insole: Single density molded removable insert