The boots in this category are designed for high level mountaineering and are suitable for use on high routes in the mountains and glaciers, and for ice climbing. They are lasted to provide a precise fit, maximum sensitivity and great performance. All boots feature single piece uppers, thick premium grade Hydrobloc® leather, tough hardware, stiff midsoles and Vibram® outer soles. They can be used with a variety of crampons, although exact choice and fitting depends on the performance and intended use of the boot.