This unique U.S. Navy and U.S Marine Corps flight approved hot weather boot offers a great combination of both cool comfort and safety. From the ASTM certified/EH rated steel toe and WT-2 flight approved fabric that are used, to the VibramA(R) Chevron outsole designed to minimize FOD and improve traction, the 330 DES ST exceeds all necessary aviation boot requirements. Belleville hot weather boots run about 1 full size larger than your running shoe size. For example, if you wear a size 10, consider wearing a size 9. VANGUARDA(R) running shoe sole construction Steel toe meets ASTM F2412-18 and F2413-18 standards for impact & compression and EH rated AR 670-1 Compliant Specifications HEIGHT: 8" (Standard Military Height) UPPER: 100% cattlehide leather & nylon fabric MIDSOLE: Highly cushioned, shock absorbent midsole OUTSOLE: 100% rubber VIBRAMA(R) Chevron to minimize FOD and improve traction INSOLE: Single density molded removable insert