Gear up for your next backpacking trip with this Smartwool PhD Outdoor Light Crew 3-Pack of socks. Mid crew socks that sit just above the top of your hiking boot. Sold as three-pair pack. 4-Degree Elite Fit System construction uses two elastics to provide better stretch and to keep your sock in place. The PhD socks are packed with technologies that are designed to keep your feet comfy so you can focus more on the trail. Indestructawool is engineered to provide maximum comfort and durability. Utilizes lightweight cushioning at the shin and sole of the foot to provide warmth and a little impact absorption. Mesh panels on the out step help provide added breathability. Virtually Seamless toe is designed for all day comfort and to minimize chaffing. Style Number: SW000564 69 percent Merino wool, 29 percent nylon, 2 percent elastane. Machine wash, tumble dry. Made in the USA.