This is a super thin quarter length sport sock for women made from Rayon (bamboo). Ideal for summer and amazing for working out/sports as they keep your feet cool. Rayon is much softer and stronger than cotton with a texture similar to silk. By wicking away moisture your feet stay dry and odor free helping prevent blisters. Be sure to check out our other bamboo low-cut socks for women in the "Sox Shop". http://www.amazon.com/gp/product/B004RQAM9M