Fiber Content: 73% nylon, 27% spandex. Care Instructions: Hand or machine-wash with warm water and mild laundry soap or laundry detergent, or use our Support Hose Washing Solutions. http://healthylegs.com/suhowaso.html No chlorine bleach. Avoid fabric softeners or products meant for Wool or Silk (such as Woolite). Warm water rinse. Hang or lay flat to air-dry. May machine dry on delicate setting if stocking does not have silicone grip tops. Helpful Hint: Placing your stockings in a mesh laundry bag will help protect them during the wash cycle.