2nds. Engineered to meet the rugged demands of United States Marine Corps, Wellco's E163 USMC R.A.T. temperate weather combat boots thrive on brutal terrain and in inclement conditions. The exterior of the boot features abrasion-resistant sharkskin leather in high-wear areas and a dependable Vibram® 139 Mr Dri-Ice rubber outsole. To combat wet weather, the interior if fitted with a waterproof breathable membrane to keep your feet dry.