The addition of Aegis antimicrobial-treated GORE-TEX fabric XCR lining adds a new level of coldburst protection to this proven, highly ventilated desert rat. GORE-TEX Extended Comfort Footwear lining keeps feet dry and comfortable. Waterproof dura leather with breathable mesh upper. Breathable ventilated bellows tongue. 7.5mm narrow gauge webbing and a 4.5mm anatomical footbed. Nylon 6.6 injection molded arch shank. Compression molded EVA footbed. Merrell Air Cushion midsole. 5mm sole lug depth. Vibram Multi-Sport sole.