The Smartwool PhD Hunt Heavy Over-the-Calf is built for performance in the highest degree! Sold as a one-pair pack. Over-the calf height. Self-adjusting welt cuff. Ribbed cuff. 4 Degree Elite Fit System uses two elastics for improved stretch and recovery. Indestructawool technology for ultimate durability in high wear areas. Heavy cushion offers significant impact absorption for long days on the trail. Mesh vents keep feet cool and dry. Virtually Seamless toe. Style Number: SW001360 69 percent wool, 30 percent nylon, 1 percent elastane. Machine wash warm, tumble dry low. Made in the USA.