Made for mountaineering and ski touring, the Mammut Aenergy SO Hybrid Pant reaps the rewards of winter softshells. The softshell fabric pairs perfectly with high-output winter sports because it's light, stretchable, and highly breathable to keep us from baking too warm on fast ascents. The hybrid pant also switches to stretch storm fleece on the knees and back of the thighs for more freedom of movement and better temperature regulation. With plenty of stretch, ventilation, and breathability, it's one of our standbys for speedy ski touring.