Our Tres Piñas socks are a One Size Fits Most (OSFM). They perfect for riding your bike, running some long miles or just for casual fashion. With a 6” cuff this sock will be your go-to sock for every occasion. Made of a light weight, soft and comfortable stretch nylon fabric (85%) including 15% Elastane for better stretch. The breathable mesh fabric on the forefoot will help you keep cool during your long hours of training.