The USMC certified hot weather 590 boot is built on Belleville's Vanguard direct injected sole system platform developed to provide combat footwear with superior shock absorption and flexibility. The 590 also features a resolable rubber Vibram outsole with an aggressive tread pattern that includes multidirectional lugs designed to perform in diverse and rugged terrain. The 590 is also a lighter weight option to the standard issue boot. 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. VANGUARD running shoe sole construction CERTIFICATION #150M22-000540-6-49 Specifications Height: 8" (Standard Military Height) Upper: 100% cattlehide leather & nylon fabric Midsole: Highly, shock absorbent midsole Outsole: 100% rubber VIBRAM Sierra Insole: Single density molded removable insert