The Smartwool PhD Outdoor Light Crew Socks are a popular choice among women trail runners. These socks are made from a blend of merino wool, nylon, and elastane, offering excellent moisture management, temperature regulation, and odor control. The light cushioning provides impact protection without sacrificing a close fit. The 4 Degree Elite Fit System ensures a secure and comfortable fit, while the flat-knit toe seam prevents chafing and blisters. These crew-length socks are perfect for cooler weather and provide extra coverage and warmth. Whether you're running on rugged trails or exploring the wilderness, the Smartwool PhD Outdoor Light Crew Socks will keep your feet happy and blister-free.