The OS1st FS4 Compression Bracing Socks do it all! These socks are designed for active use and provide relief from ankle swelling, varicose veins, plantar fasciitis, Achilles tendonitis, heel and arch pain, and shin splints. With OS1st's Compression Zone Technology, these socks have five zones of medical-grade (20 - 30 mmHg) compression designed to stimulate blood flow and improve circulation, helping with active recovery in addition to pain relief. And, like any good performance sock, they are anti-microbial and made from moisture-wicking materials, helping to prevent blisters and keep your feet odor-free. The Y-gore heel pocket ensures your heel fits snugly into the sock, lining your foot up perfectly with the structure of the sock to make sure you take advantage of all the injury relief and prevention features the FS4 Compression Bracing Socks have to offer!

Sizing (by ankle/calf circumference and shoe size):

Small - 6.5 - 8.5 / 17 - 22 cm | 9.5 - 14.5 / 24 - 37 cm | M 3 - 5.5 / W 4 - 6.5
Medium - 8.5 - 10.5â/ 21 - 27 cm | 12 - 17â/ 30 - 43 cm | M 6 - 9.5 / W 7 - 10.5
Large - 9.5 - 12.5 / 25 - 31 cm | 14 - 19 / 35 - 48 cm | M 10 - 13 / W 11
X-Large - 12 - 14 / 30 - 35 cm | 14.5 - 20 / 37 - 51 cm | M 13.5 - 15