Supports larger muscles and tendons, strengthens forearm and elbow.Relieves elbow pain caused by Tennis Elbow & Golfers Elbow (Lateral or Medial Epicondylitis), and other painful conditions. Designed to move as you move with stay-in-place construction. Protects against sun damage. Ultra-thin, moisture-wicking comfortable arm sleeve. Easy-on and easy-off design can be used anytime and fits comfortably under any clothing or sportswear