The Le Bent Pro Series Snow Sock uses a merino wool and bamboo rayon blend that regulates temperature and resists odor through a full day on the mountain. A proprietary fit system and Memory Stretch construction mold the sock to the foot, while ankle and Achilles support minimize heel lift on the hike up and the descent down. A silicone strip at the calf keeps the knee-high cuff locked in place, so the fit holds through boot buckles, bindings, and everything in between. What Our Gearhead(R) Experts Are Saying:"I've worn these on back-to-back lift laps and a full day of skinning without ever stopping to pull the cuff back up or fight a slipping heel."