The Icebreaker Women's Ski Ultralight Sock utilizes graduated compression and merino wool for the ultimate in comfort and performance. Graduated compression applies pressure to the leg in order to improve bloodflow, decrease soreness, and speed up recovery time. Made mostly of merino wool, the Ski thermally regulates your leg's temperature, naturally resists odor, and retains a super soft feel. Icebreaker also added light cushioning at the Achilles for comfort and an anatomical toebox for dexterity. The LIN seam might just the be the smallest seam you've ever seen, applied here for extra comfort.