The Darn Tough No Show Light Hiker Slate women’s socks is a lightweight Merino Wool trail hiking socks that features terry loops under the foot reaching above the ankle for comfort and protection. The sock includes a fine gauge knitting, true seamless fusion, fast action wicking and is naturally antimicrobial. The no-show sock is made of 54% nylon, 43% merino wool and 3% Lycra Spandex.