You don't need a PhD to figure out what a class act these Smartwool PhD(R) Outdoor Light Crew socks are. Sold as a one-pair pack. Crew cut length sits at calf. Features a light, half-cushioned outdoor sock ideal for light hiking, trail running and biking. Ribbed cuff with ankle band for comfort. Contoured Flex Zone on topside. 4-Degree Banded Fit System construction for performance fit. Arch band at upper and lower instep for support. WOW technology in High Density Impact Zones (forefoot/heel) to reduce shock and abrasion. Wool on Wool (WOW) technology adds an additional layer of 100% SmartWool(R) Duroyarn(TM) to give the PhD sock line up to 30% more durability, performance and comfort. SmartWool(R) infused for moisture, temperature and odor control. Duroyarn(TM) reinforcement for added comfort and durability. Strategic Mesh Zones for maximum ventilation. Style Number: SW001311 58% wool, 39% nylon, 3% elastane Machine wash, tumble dry. Made in the USA.