The Trango Alp GTX is perhaps the best all round trekking, mountaineering & technical scrambling boot available. Intended for multi-use in all terrains the Trango Alp GTX is versatile enough to accept a semi-automatic crampon for winter duties & comfortable enough for long high level treks such as the Haute Route or a GR route. The uppers are a mix of leather & synthetic materials for the best durability, breathability & comfort. The Vibram sole features the impact brake system where the lugs of the sole are oriented in opposing slanted directions to increase braking forces by 20% & decrease impact forces by 20%, this really makes a difference when descending to reduce fatigue & impact. With a slightly higher ankle than most other boots of this type the Trango offers superb support yet allows mobility in all directions thanks to the 3D multidirectional flex system. Fully Gore-Tex lined for complete waterproofing & breathability these boots are suitable for all year round activities where you can expect extremes of weather.