After a long day skiing, prepping the cabin, and crafting the perfect campers' dinner, the Tundra Aerogel Sock provides our feet the comfort and warmth they need to recover. Outdoor Research employs Cross Core technology to keep our toes toasty, even when we travel outside to admire the view. The Pertex Quantum shell keeps falling flakes from soaking into the insulation, and the slip-resistant sole ensures we're sturdy as we venture in and outdoors.