Comfortable Heel and Toe Pocket doesn't pinch Comfort welt top band 20-30 mmHg Graduated Compression promotes circulatory wellness Assists with relief of leg pain and swelling Helps reduce the risk of varicose veins Small - Ankle 7-8.75" Calf 11.25-15" Medium - Ankle 8.75-10" Calf 12-16.5" Large - Ankle 10-11.5" Calf 12.5-18" X-Large - Ankle 11.5-13" Calf 13.5-19.75" XX-Large - Ankle 13-14.5" Calf 19.75-21"