Motorola SF600 Wireless Sports Headphones - Black (Bulk Packaged) Lose The Wires. Breakthrough HD Audio. Powerful, Intense Audio, Just Like Your Workout. Sweat-Proof & Durable. Designed To Keep Moisture Out And Made With Kevlar Fiber To Hold Up To Your Toughest Workouts. Ultimate Custom Sports Fit. Seven Sizes Of Ear Cushions Included For A Perfect And Secure Fit.