Designed with the input of Scarpa athlete and speed demon Ueli Steck, the crazy light Scarpa Rebel Pro GTX Men's Mountaineering Boot moves so fast it seems to hover uphill. This boot, the lightest weight insulated boot in Scarpa's Tech Mountain category, features a Gore Tex Insulated Comfort lining to keep your foot warm and dry. The tongue is constructed with Gore Tex Insulated Stretch fabric for a smooth, bunch free fit and assured protection at this closure, as well as excellent breathability. Black ice' Frozen waterfall' No problem. The Rebel Pro is automatically crampon compatible thanks to TPU inserts in heel and toe. And with its carbon fiber insole and Tri Density PU shock absorbing midsole, this boot keeps its weight to a minimum while providing hardcore support on technical climbs. Vibram's TT Lite outsole withstands rugged alpine wear and tear and features a grippy toe climbing zone. Packed with features, strong, and feathery, this boot passed muster with Steck, and it will with you, too.