Features: Four options: 8-15 mm hg sheer (0815). 8-15 mm hg sheer wide calf (0815 w). 10-18 mm hg knit (1018). 10-18 mm hg knit wide calf (1018 w). The 8-15 mm hg sheer is a thin, hosiery-style compression sock. The 10-18 mm hg knit is a slightly thicker, soft-knit compression sock. 8-15 mm hg sheer: Knee-high, closed-toe. Women's shoe sizes 5-11. Calf circumference up to 17". 8-15 mm hg sheer wide calf. Knee-high, closed-toe. Women's shoe sizes 5-11. Calf circumference up to 22". 10-18 mm hg knit: Knee-high, closed-toe. Women's shoe sizes 6-12. Calf circumference up to 18". 10-18 mm hg knit wide calf: Knee-high, closed-toe. Women's shoe sizes 6-12. Calf circumference up to 22". The sizing range is dependent on calf circumference, shoe size, and leg length.