The Motorola SF600 Wireless Sports Headphones feature breakthrough wireless HD Audio. Lose the wires and experience powerful, intense audio, just like your workout. Sweat-Proof and Durable. Made with Kevlar fiber, hydrophobic mesh and water-repellant nano-coating so it holds up to your toughest workouts. Customizable sports fit. Lightweight and flexible design with rotating ear stems for a comfortable and secure fit.