Certified by the U.S. Navy for both flight and flight deck use, the all leather, Gore-tex lined 800 ST is fully waterproof and contains a 100% rubber Vibram Chevron outsole to minimize FOD and improve traction on wet shipboard surfaces. Belleville Gore-Tex boots run about 1/2 size larger than your running shoe size. For example, if you wear a size 10, consider trying a size 9.5. VANGUARD running shoe sole construction Steel toe meets ASTM F2412-11 and F2413-11 standards for impact & comprehension and EH rated Durably waterproof and highly breathable GORE-TEX fabric Specifications Height: 8" (Standard Military Height) Upper: Smooth, 100% cattle hide leather Midsole: Highly cushioned, shock absorbent midsole Outsole: 100%rubber VIBRAM Chevron to minimize FOD and improve traction Insole: Single density molded removable insert