Looking for relief from shin splints and muscle cramps? Try the OS1st CS6 Performance Calf Sleeve! Light and comfortable, these calf sleeves provide relief from pain and injury. Compression Zone Technology boosts circulation and stabilizes your muscles to reduce impact vibration. Its easy-on anatomical fit can be worn before, during or after any activity. If you want to keep your legs fresh and injury-free, try the OS1st CS6 Performance Calf Sleeve! Compression Zone Technology boosts circulation, protects from injury, eases shin splints and provides increased muscle support to reduce impact vibration Easy-on anatomical fit designed to be worn before, during or after any activity.