The G20 is a new generation of technical crampon bringing together 190 years of Grivels experience, the most advanced R&D. This is a crampon for the hardest mixed & the steepest ice where lightness & sensitivity are paramount & at 794g it is the lightest technical crampon in the world! Patented Mono Rail technology in hot drop forged Chromolly steel gives asymmetric left & right mono front points. Rear facing points on the footplate give greater security when hooking ice features or back stepping. Easy adjustment, macro with tools & micro tool free, give a size range of 37 to 47.