These environmentally-friendly socks are made with a special polyester yarn which is spun from recycled materials. They are specifically engineered for extreme moisture management. They have a faster drying time, superior comfort, and exceptional softness. Our DRYALLDAY socks have an all terry construction for unrivaled cushioning. Designed by a podiatrist with comfort and foot health his main concern. This wonderful sock keeps feet dry. Care instructions- Machine wash cool water, tumble dry low.