3-D knit structure using air covered spandex yarn that is soft to touch and comfortable for all day wear. Reinforced heel, designed for long lasting durability. Relief is appropriate for use by both men and women. Compression 20 to 30 mmHg. Medium compression stockings have closed toes and fit ankle circumferences 8-3/8 to 9-7/8 inches with calves between 11-7/8 and 16-1/2 inches in circumference.