Turn the heat up on the pavement, and not in your shoes, when you gear up for your next run with this Smartwool running sock! Sold as a three-pair pack. Micro sock sits below the ankle. Light elite cushioning offers optimal impact protection with targeted cushioning at the ball and heel of the foot. 4 DEGREE Elite Fit System employs two elastics for greater stretch and recovery. ReliaWool technology delivers long lasting wear. 200 needle construction provides the highest knit density without compromising its light weight. Strategically-placed mesh vents for temperature and moisture management. Achilles tab helps reduce the likelihood of irritation. Virtually seamless toe. Run-specific fit. 51 percent merino wool, 46 percent nylon, 3 percent elastane. Machine wash inside out on a warm, gentle cycle. Tumble dry low, lay flat, or line dry. Made in the U.S.A. from imported yarn.