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The OS1st TA6 Thin AirTM Performance Calf Sleeves feature 6 zones of graduated light compression, a shaped-to-fit design for all body types made with ultra-soft yet durable microfiber.  These sleeves will amaze you with the patent pending air-flow system through the super thin upper and lower zones. No binding, no bunching, no pinching…just the perfect fit for enjoyment of your active lifestyle. OS1st calf sleeves are easier to move in compared heavier supports.  Find prevention and relief from muscle cramps, shin splints and Achilles tendinitis. Enhanced circulation keeps your legs and muscles supported through mild to intense activity.