Smartwool PhD® Womens Outdoor LIght Micro The PhD® Outdoor Light micro is made for the trail. Featuring Indestructawool technology for ultimate durability, weve designed this sock to outlast your greatest adventures. And with features like mesh zones for maximum breathability, a Virtually Seamless toe and the power of Merino, theyll help keep you comfortable every step of the way. A micro height barely shows above low trail shoes while the womens-specific fit provides an overall slimmer fit and narrower heel. Features: Sock Height: Micro Body-mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort Women's specific fit: narrower heel and overall slimmer fit 1.5" overall height Made in USA of Imported Yarn: 60% Merino Wool, 38% Nylon, 2% Elastane Care: Machine Wash Warm, Wash Inside Out. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.