LOWA's functional GORE-TEX-lined Combat GTX boot offers outstanding climate-controlled comfort and waterproofing. The 10-inch boot has a water-repellent, 2.6mm cowhide leather upper and a Vibram Tsavo outsole unit with shock-absorbing midsole. The climate-control insole features a series of perforations, or holes, inside the boot's cuff lining, allowing air to enter the boot lining while walking movement "pumps" heat and moisture back out through the holes. The Combat GTX is available in men's sizes 7 to 12, 13 and 14.