RUN HARD, PLAY HARDERThe Smartwool PhD Running Ultra Light Micro socks are ready for training and race day, with a smart updated design that will carry you through the miles in comfort. FEATURESNon-cushioned, precise fit and 1.5-in. no-show height are optimal for pairing with modern minimalist footwear4 Degree Elite Fit System improves comfort and offers great stretch and recovery to keep the socks in placePatent-pending ReliaWool technology in high impact areas provides long-lasting protection to keep feet comfortableMesh ventilation zones designed specifically for male runners provide optimum temperature regulation and moisture managementVirtually seamless toeAchilles tab200-needle construction provides high knit density while maintaining ultralight weight