OS1st ES3 Performance Elbow Sleeve Sports Medicine : The OS 1st ES3 Performance Elbow Sleeve helps create compression and aids in pain relief from lateral epicondylitis (tennis elbow) and medial epicondylitis (golfers elbow). Enhanced with the Compression Zone TechnologyA(R), athletes can experience three levels of graduated compression in this lightweight sleeve. This sleeve is perfect for wearing during activity throughout the day or for taking along in your gym bag. Can be worn comfortably under clothing during running or recovery. Helps reduce swelling. Helps ease elbow pain associated with playing tennis and golf. Sleeve material is moisture-wicking for enhanced breathability.