Extra Firm Compression Level (30-40mmHg) Indication Guide: (1) Severe varicosities (2) Severe edema (3) Lymphatic edema (4) Chronic venous insufficiency (5) Orthostatic hypotension (6) Postphlebetic syndrome (7) Management and preventing recurrence of venous ulcerations (8) Post surgical Fiber Content: 72% Nylon, 28% Spandex This product is Latex free 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