Truform Men's Dress Knee High Support Sock, 30-40 mmHg, closed toe box, navy 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.