PREMIUM HD STEREO SOUND + RICH BASS: Surround yourself with Rich Crystal Clear High Fidelity Sound and Impressive Volume Capability. Take your workout to the next level with Superior Dynamic Acoustics delivering Deep Rich Bass and Crystal Clear Treble through cutting-edge components and the V-Shaped Sound Signature Profile. SECURE FIT - GREAT FOR SPORT: Specifically designed for sports enthusiasts, the HARNESS SC750 Bluetooth Headphones are perfect for Gym Workouts, Running, Jogging, Hiking, Biking, Yoga, CrossFit, etc... The ultra-lightweight ergonomic design delivers a comfortable and stable fit by securing behind your ears with soft flexible ear-hooks and resting comfortable in the ear canal with premium soft silicon ear tips. IPX7 WATERPROOF & SWEAT-PROOF. No need to worry about rain or sweat; Smash your goals and sweat your heart out with the IPX7 Waterproof rating. The IPX7 Waterproof coating provides a double layer of protection on the shell and internal components. This design makes them the absolute best wireless headphones for sports.