SmartWool® Women's PhD® Outdoor Light Cushion Micro is made for the trail. Featuring Indestructawool™ technology for ultimate durability, designed to outlast your greatest adventures. And with features like mesh zones for maximum breathability, a Virtually Seamless™ toe and the power of Merino Wool, they’ll help keep you comfortable every step of the way. A micro height barely shows above low trail shoes while the women’s-specific fit provides an overall slimmer fit and narrower heel. PhD® - built for Performance in the Highest Degree 4 Degree™Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place Indestructawool™ technology features a patent-pending construction method for exceptional durability and comfort Women's-specific mesh ventilation zones provide additional breathability and moisture management Narrower profile provides perfect women's-specific fit Virtually Seamless™ toe for enhanced comfort Light Cushion ideal for varied trail and road terrain Micro height: 1.5" overall height Made in USA of Imported Yarns Size Chart: S fits Women's shoe sizes 4-6.5 M fits Women's shoe sizes 7-9.5 L fits Women's shoe sizes 10-12.5 Product Features: Fabric:Merino Wool blend SmartWool Women's PhD Outdoor Light Cushion Micro Sock - Special Purchase