The Mammut Brecon III GTX is a fully waterproof half-height walker's boot with a braced insole, made from full-grained, durable smooth leather.Designed for easy backpacking or the occasional alpine trek, they are supportive and comfortable enough for all-day wear, with integrated Mammut Motion-Control which gives great flexibility and strong lateral support.They have a grippy, cushioning and perfectly rolling Vibram MT Traction sole, a waterproof GORE-TEX Performance Comfort Footwear membrane, and cushioning memory foam around the tongue and ankle.GORE-TEX membrane - waterproof and breathable to keep you dry and coolMammut Motion-Control - sturdy ankle support with enhanced flexibilityVibram MT Traction sole - strong, cushioning gripMemory foam around tongue and ankle - provides exceptional comfort