Move your best foot with the Smartwool® PhD® Outdoor Ultra Light Micro 3-Pack! Sold as a three-pair pack. Micro length with mini tab hits at ankle. Ribbed cuff with ankle band for comfort. 4-Degree Banded Fit System construction for performance fit. Arch band at upper and lower instep for support. Ultra light WOW technology in High Density Impact Zones (forefoot/heel) to reduce shock and abrasion. SmartWool® infused for moisture, temperature and odor control. Strategic Mesh Zones for maximum ventilation. 50% wool, 49% nylon, 1% elastane Machine wash cold. Line dry. Made in the USA.Move your best foot with the Smartwool® PhD® Outdoor Ultra Light Micro 3-Pack!