The first sage green boot to be approved by the U.S. Air Force for flight use. Built exactly to the same specifications as the previously approved black flight boots, the 690 allows for an easy transition to a new flight boot that airmen have been comfortable, familiar and happy with, for years. 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 Durably waterproof and highly breathable GORE-TEX fabric Specifications Height: 8" (Standard Military Height) Upper: 100% cattlehide leather & nylon fabric Midsole: Highly cushioned, shock absorbent midsole 100% rubber VIBRAM Sierra Outsole: 100% rubber VIBRAM Sierra Insole: Single density molded removable insert