Only tried on, then stored at home. No returns. Please refrain from purchasing if you are concerned about minor details. Improves motor skills and concentration. Headband type. Wear for training to improve dynamic vision and concentration, accuracy, and hitting sense. Train in outdoor or indoor, confined spaces. Aerobic exercise. Boxing, kickboxing, Muay Thai, mixed martial arts, baseball, basketball, soccer, tennis, badminton, table tennis.