- Size: 37.5 - AKU COLDAI NBK GTX hiking boots designed for men and women, perfect for mountain trails and trekking - Durable brown nubuck upper, made with high-quality materials of European origin - Gore-Tex membrane ensures waterproofing and breathability at all times - Vibram Selvatica Megagrip sole provides superior traction and long-lasting durability - Aku Elica Natural Stride system to optimize the natural movement of the foot and reduce fatigue - Injected EVA midsole offers lightness and excellent cushioning - 1.5 mm nylon insole and EVA cut for greater support and comfort - Lightweight and comfortable boots, suitable for prolonged use and winter conditions - European manufacturing with leather from Italian tanneries, committed to quality and the environment