Take them ski mountaineering, backcountry stash raiding, or on-hill charging. The Celeste 3 are excellent all around boots for sustained ascents and technical, performance-oriented descents. Stiff enough to get solid performance out of your skis, they&';re comfortable for working your way up the switchbacks and navigating icy kick turns. Breathable liners can be used out of the box or thermoformed for custom fit. Shells are light, stiff Grilamid with a bi-material tongue for mobility. Redesigned walk/ski mode mechanism is durable and simple to use. 4 micro-adjustable buckles stay in place in tour mode with buckle catch system. PWR Lite High liner can be thermomoulded for custom fit. Shock damper inserts in the inner sole act absorb shock when skiing. 60-degree cuff rotation promotes mobility. Sole is touring and tech compatible, VibramA(R) bi-density rubber that adds traction when hiking. Flex index is 125.