Certified by the U.S. Navy for flight use, the chocolate brown 330 ST boot provides both comfort and functionality to support the special needs of Naval aviators. Perfect for wet weather environments, the 330 ST has an all leather upper that resists water and a 100% rubber Vibram Chevron outsole designed to minimize FOD and improve traction on wet surfaces. Chocolate brown 100% cattlehide leather upper VANGUARDA(R) sole construction combining a cushioned direct injected midsole with a 100% rubber VIBRAMA(R) Chevron outsole for FOD minimization Steel toe is ASTM F2412-18 and F2413-18 certified and EH rated Soft removable insole 8" height Made in USA & Berry Compliant U.S. Navy & U.S. Marine Corps Flight Approved 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