Switch gears when it comes to your cycling socks. These Merino cycling socks are breathable and super soft, and they provide comfort for the long ride ahead. These Women's PhD(R) Cycle Ultra Light Micro socks are packed with technologies - Shred Shield(TM) technology reduces wear from toes, Indestructawool(TM) technology provides ultimate durability, and activity-specific mesh zones help your feet stay dry and happy.. . 46% merino wool/50% nylon/4% elastane. PhD(R): Built for Performance in the Highest Degree. 4 Degree (TM) Elite Fit System: Uses two elastics for greater stretch and recovery to keep the sock in place. Indestructawool(TM) technology features a patent-pending construction method for exceptional durability and comfort. Ultra Light cushioning. Body-mapped mesh ventilation zones. Virtually Seamless(TM) toe. Shred Shield(TM) 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. Achilles Tab prevents sock from slipping down into shoe. 1.5 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.