ALPINE SL GTX - FLAMERecommended for: fast and light technical mountain climbing and glacier travel. A breakthrough in alpine boot design, this next gen concept was developed in conjunction with alpinist David Gttler who sought a super lightweight high altitude training acclimatization boot. The flexible LOWA REPTEX abrasion resistant upper is injected with PU scales that mimic a reptiles protective skin, thus replacing a traditional heavy rubber rand, while the VIBRAM