Features: Four Options: 8-15 mmHg Sheer (0815) 8-15 mmHg Sheer Wide Calf (0815W) 10-18 mmHg Knit (1018) 10-18 mmHg Knit Wide Calf (1018W) The 8-15 mmHg Sheer are a thin, hosiery-style compression sock. The 10-18 mmHg Knit are a slightly thicker, soft-knit compression sock. 8-15 mmHg Sheer Knee High, Closed Toe Women's Shoe Sizes 5-11 Calf Circumference up to 17" 8-15 mmHg Sheer Wide Calf Knee High, Closed Toe Women's Shoe Sizes 5-11 Calf Circumference up to 22" 10-18 mmHg Knit Knee High, Closed Toe Women's Shoe Sizes 6-12 Calf Circumference up to 18" 10-18 mmHg Knit Wide Calf Knee High, Closed Toe Women's Shoe Sizes 6-12 Calf Circumference up to 22" *Sizing Range is dependent on Calf Circumference, Shoe Size, and Leg Length*