The Womens Smartwool PhD Running Ultra Light Micro Socks feature targeted cushion without the weight. Combining athletic science and SmartWool quality, these PhD socks support and cushion your feet while wicking moisture and controlling temperature. These lightweight micro length socks feature SmartWool cushioning in the critical impact zones for added protection and durability. Designed with SmartWool's new 4-Degree Elite Fit System, the SmartWool PhD Running Ultra Light Micro Socks work with the mechanics of the athlete's foot features even better stretch and recovery for an exceptional fit in critical areas. Designed for the contours of a woman's foot, The Womens SmartWool PhD Running Ultra Light Micro Socks helps you go the distance without weighing you down.