A favorite of through-hikers and day-trippers alike, the Women's PhD? Outdoor Light Mid Crew packs some serious trail power. Featuring a versatile, multi-sport design, this lightweight style includes Indestructawool?? technology for ultimate durability in high-wear areas. And, when it comes to comfort, this style pulls out all the stops: the 4 Degree?? elite fit system provides a dialed-in fit, and the signature Virtually Seamless?? toe offers extraordinary comfort in any trail shoe. Plus, new Shred Shield?? technology helps reduce wear from toes.. . 54% wool/44% nylon/2% elastane. 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. Light cushioned sole for added warmth with minimal volume. Body-mapped mesh ventilation zones. Virtually Seamless?? toe. Shred Shield?? technology, Smartwool's newest technology, reinforces the toe cap with minimal cushioning. The result reduces excess friction from the toe and around the toenails and increases durability three times. Women's-specific fit, with a narrower heel and slimmer profile. 7.5 in. height. Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.. Made in USA of Imported Yarns.