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U.S. AIR FORCE FLIGHT APPROVED VANGUARD® Running Shoe Sole Construction Upper Material – Black Leather / Nylon Fabric GORE-TEX® Fabric Bootie Lining ­- OMAHA Moisture Wicking Lining 200g THINSULATE™ Insulation Cushion Midsole – Polyurethane Outsole – Rubber, VIBRAM® Sierra Polyurethane Removable Insert Height – 8” (Standard Military Height) PLEASE NOTE: THERE IS A $20 SURCHARGE ON SHIPMENTS TO ALASKA AND HAWAII