The Darn Tough Women's Cushion Boot Sock adds subtle support and obvious comfort to your next alpine trek. Designed with natural merino wool, the Cushion Boot Sock quickly and effectively pulls moisture away from your skin to help prevent a wet, blister-conducive environment. Merino wool breathes, offers excellent thermoregulation, and naturally fights odors. High-density knit on bottom of foot cushions your foot mile after mile. Reinforced heel and toe don't have any seams to rub you the wrong way. Elastic support around arch offers a snug, supportive fit.