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For tackling mixed routes and technical expeditions, the Ortles Couloir Boot is among our top picks as Salewa's lightest boot in the line because of its completely modernized design. The carbon fiber and Kevlar cuff on the outer boot supplies protection from rocks and crampons, while the thermo-insulated inner boot features a stretch gaiter with silicone gripping points to keep snow out, and socks dry--for days on end in unrelenting alpine conditions.