Truform Men’s Dress Knee High Support Sock, 30-40 mmHg, closed toe box, black nylon-spandex rib-knit fabric, soft non-compressive top, knit-in heel, size Medium, 8.25″ – 9.75″ (21 – 24.8 cm) ankle circumference, 13.5″ – 16″ (34.3 – 40.6 cm) calf circumference, up to 16″ (40.6 cm) length to knee.