The OS1st Thin Air Performance Calf Sleeves provide relief from shin splints, calf cramps, Achilles tendonitis, and more using support and graduated, medical-grade compression. OS1st's Skin Thin Zones Technology keeps your legs cool and applies varying levels of pressure to six different zones, giving you just the right amount of compression in each area to promote circulation and make the sleeve breathable while hastening recovery and keeping you comfortable at rest or during workouts. With a slim profile, the OS1st Thin Air Performance Calf Sleeves can also be comfortably worn under clothing. During workouts, moisture-wicking fabric helps keep the sleeves on securely, preventing chafing and making sure they stay in place, with no bunching, no matter what you're doing! Each package includes two compression sleeves.

Sizing (by ankle/calf circumference):

Small - 6.5″ - 8.5″ / 17 - 22 cm | 9.5″ - 14.5″ / 24 - 37 cm
Medium - 8.5″ - 10.5″ / 22 - 27 cm | 12″ - 17″ / 30 - 43 cm
Large - 9.5″ - 12.5″ / 24 - 32 cm | 14″ - 19″ / 35 - 48 cm
X-Large - 12″ - 14″ / 30 - 36 cm | 14.5″ - 20″ / 37 - 51 cm