Feel active in absolute comfort - For all those who have to spend long hours sitting or standing, they apply a gradual compression that helps to improve blood flow. Material 50% bamboo, 25% recycled polyester, 10% recycled nylon, 15% spandex. Care For best results, the brand strongly recommends that you wash them on a cold cycle (30o) and avoid bleach or fabric softener. Thanks to the antibacterial composition of their fibers, they kill bacteria and odor, so they can be washed after 3 uses, but it will always depend on the use they have been given. They simply dry in the air. These Bamboo Compression Socks are made of a flexible material composition that prevents them from shrinking. Please follow the washing instructions to avoid damaging the socks.