ECCO Men's Single Anklet Socks with Mesh Top and Cushion 85% Cotton/10% Nylon/5% Spandex Machine Wash A lightweight, moisture absorbing fiber. No other fiber offers the comfort and feel of nature's own fiber. It is breathe-able, washable, and biodegradable. Cushioned foot for additional comfort. Reinforced heel and toe for extra long wear. Finer fabric due to higher needle count.