What Our Gearhead(R) Experts Are Saying:"Compression in a ski sock is a legitimate performance feature, not just a marketing note. Graduated compression keeps blood moving through a long day locked into a ski boot, which reduces the foot fatigue that usually sets in by early afternoon. The merino content handles moisture and odor over multi-day use without needing a wash between sessions. At 90 grams it's a medium-weight sock that fits properly in a performance boot without creating pressure points. Heli guides wear these for a reason."Long days in ski boots ask a lot from your feet, and most socks are not built to answer. The Black Diamond Merino Compression Ski Sock is. Graduated and targeted compression works through the polyamide and spandex blend to keep circulation moving from the first chair to the last run, which reduces the foot fatigue that compounds over a full day of hard skiing. Merino wool makes up nearly a third of the construction, managing moisture and resisting odor through multi-day backcountry trips without requiring a wash between sessions. At 90 grams the sock sits in a medium-weight range that fits properly inside a performance boot without adding pressure or bulk. The stay-put fit keeps it from shifting or bunching inside the liner over the course of a day, which is the detail that separates a good ski sock from one you forget about by run three. Built in the US and designed for the kind of skiing that asks everything of your gear.