Wear it while you're doing your workout or under your everyday clothes. Compression clothes should be skin tight to support your muscles during training and competitions. Can be a preventative measure by helping to reduce muscle damage by reducing shaking that occurs while working out. The addition of copper aids in reducing fatigue and soreness during and after workouts. Compression also aids recovery by improving circulation and blood flow. This is a pre-owned garment in very good condition. There is a tiny pin hole on the front of the left sleeve. See picture.