When youve got miles to go, you need to rely on the comfort and protection of Thorlos. Sold as a three-pair pack. No show sock sits below the ankle. Designed for the serious runner who needs maximum cushioning with minimal weight. Contoured ventilated sock frame. Lycra fiber in arch and instep for a no slip fit. Specially sculpted Thlo pads in the ball and heel provide protection from shear and impact where needed. 76 percent acrylic, 18 percent nylon, 4 percent spandex, 2 percent polyester. Machine wash cold, tumble dry low. Made in the U.S.A. Made in the USA.