A heavy duty backpacking and alpine hiking shoe with a high tech modern design the Alto Guide High meet the full spectrum of requirements for expeditions. For hiking through snow and ice a Gore-Tex waterproof lining and an elastic Gore-Tex tongue keeps the ankle and foot dry. Over exposed rock faces and ascents over boulders a very grippy Vibram Maton sole keeps you seriously grounded. Finally doubled, free-sliding heel straps protect the heel and provide support and 3 zone lacing holds the foot in place for comfortable hiking in the world's toughest environments.