REDUCE LEG FATIGUE - Therapeutic 15-20 mmHg Pressure Helps to Decrease Aching Legs and Feet and Swollen Ankles RELIEVE COMMON LEG PROBLEMS such as Varicose Veins, Swelling, Muscle Pain and Tired Legs - Hi Quality Material Won't Lose its Compression. Quality No-Snag Zips. Socks Stay Zipped All Day Long. LARGE OR SMALL FEET? Open-Toed Design Allows for Any Foot Size. Our Zipper Compression Socks reduce leg pain and tiredness through carefully engineered graduated compression. The socks are designed to especially help people suffering from any of the following conditions: - Tired Legs (Leg Fatigue) - Aching Feet - Swollen Ankles - Varicose Veins - Lymphedema - Sore Muscles You will notice an immediate difference when you start to use them - Size Chart - Medium : Calf 10-14 inches (or Ankle 6-9 inches) - Large : Calf 13-18 inches (or Ankle 8-10 inches) - XXLarge : Calf 18-22 inches (or Ankle 9-12 inches)