What Our Gearhead(R) Experts Are Saying:"The zig-zag grip panels are what separate this from a standard compression ski sock. When you are skinning for hours and your foot starts to move inside the boot, you lose energy and gain blisters. The non-slip profile addresses that directly. Strategically placed ventilation zones help manage heat on the uphill without leaving you cold on the descent. If you have had blister problems on tour, this sock is worth trying before you blame your boots."Ski touring puts demands on a sock that resort skiing does not. Hours on a skin track mean heat, moisture, and foot movement that compound into fatigue and blisters by the time you reach the top. The Black Diamond Tour Compression Ski Sock is built around those specific conditions. Zig-zag patterned grip panels on the exterior increase friction between sock and boot liner, keeping your foot positioned correctly through long climbs so your energy goes into the skin track instead of fighting for footing. Graduated compression keeps circulation moving through the sustained effort of the uphill, while strategically placed ventilation zones manage the heat that builds on the ascent. Padding sits where impact and pressure accumulate on the descent, and 18% merino wool handles moisture and odor across multi-day backcountry trips without needing a full wash between sessions. Made in the US at 76 grams, this is a sock that understands the difference between a lift-served day and a real day in the mountains. Size up if you are between sizes.