A breakthrough in alpine boot design this next-generation concept was developed jointly with mountaineer David Goettler who was looking for ultra-light training and acclimatization boots for high altitudes. Polyurethane “scales” are introduced into the flexible, wear-resistant Lowa Reptex upper which imitate the protective skin of a reptile thereby replacing traditional heavy rubber and the Vibram alp trac SL sole is equipped with Litebase technology which significantly reduces the weight and thickness of the sole without affecting its grip or wear resistance. Compatible with combination cats. Durable waterproof and breathable Gore-Tex lining to protect your feet from the elements.