This Thorlos Running Rolltop 3-Pair Pack can get you through those hills and inclines with ease! A sock with a modest rise and tab heel collar that stops just below the ankle. Sold as three-pair pack. Heavyweight padding at ball and heel provides protection against shock, impact and shear forces to protect feet from blisters. THOR-LON throughout the body of the sock wicks moisture, keeping feet drier and reducing blisters while remaining soft and durable. Lightweight padding in arch and instep provides protection and allows better arch support and less pressure on the feet. Padding over the toes offers additional protection against quick stops and lateral movement during runs. Low profile toe seam wont irritate foot. Machine wash, tumble dry. 86 percent THOR-LON acrylic, 13 percent stretch nylon, 1 percent spandex. Made in the USA.