If you're looking for the lightest, most comfortable socks possible, look no further than the Darn Tough RFL Thermolite OTC Ultra-lightweight Women's Socks. Made in the USA from a blend of polyester, spandex, nylon, and Merino wool, these socks are ultra-lightweight and perfect for race day or anyone who wants a lighter-than-air feel. The True Seamless technology allows for an undetectable seam fusion for an ultra-smooth, invisible feel, and the over-the-calf height ensures that your socks will stay in place all day long. The composition of the socks - 53% nylon, 42% polyester, 5% Lyra spandex - provides fast action wicking to pull moisture away from the skin, so your feet will stay dry and comfortable for hours of rigorous activity. Multi-zone mesh panels drastically improve venting and flexibility and reinforced achilles and footbeds create the perfect fit and enhance durability. The truly ideal sock for all adventures, the Darn Tough RFL Thermolite OTC Ultra-lightweight sock for women is a total gamechanger.