PLEASE NOTE: Calf sleeve sizing is based on calf circumference. See size chart before ordering. The CW-X Revolution Compression Calf Sleeve offers peak calf support for the demanding athlete. The EXO-Lite Seamless Support Web™ supports the muscle and improves the biomechanics of the motion, allowing more power to be efficiently concentrated. Gradual compression in the sleeve aids in circulation and the recovery of the muscles by minimizing lactic acid build up. Moisture-wicking, seamless four-way stretch fabric provides comfort and keeps you cool and dry. The UPF 50+ rating offers significant protection from harmful UV rays. Sold as one pair. 50% nylon/50% spandex. Imported.