These ergonomically brilliant, acoustically driven headphones provide an unparalleled level of comfort and fidelity for athletes, runners, and music lovers. The patented Ear-Lock technology guarantees a secure fit, even at extreme activity levels. - - Yurbuds - Ergonomically BrilliantYurbuds Earbud Enhancers provide an unparalleled level of comfort and fidelity with a fit that ensures the earbuds stay in your ears, even during the most strenuous physical activity.Ultra-Soft Comfort and Extreme Fit GuaranteeLight and Intense style Yurbuds Earbud Enhancers guarantee a perfect fit. Made from ultra-soft medical grade silicone for extreme comfort during extended listening periods.Richer AcousticsYurbuds Earbud Enhancers are clinically proven to improve sound quality and deliver deeper, richer acoustics. Enjoy music and the world around you like never before.Bluetooth® DevicesYurbuds Earbud Enhancers are compatible with Jawbone® ICON & Jawbone® Prime headsets and are clinically proven to enhance the sound during your calls.Universal CompatibilityYurbuds Ironman Series headphones work with mp3 devices including Apple® iPod®, iPhone® supporting an industry standard 3.5mm (1/8") gold plated stereo mini-plug for wide-ranging compatibility.Designed by a TriathleteAvid triathlete Seth Burgett, CEO of Yurbuds came up with the award-winning idea for custom fit earbud enhancers while participating in an Ironman competition. Yurbuds Earbud Enhancers were created for the human ear by athletes, audiologists, and engineers to stay in place, avoid pressure points, and provide a pain-free listening experience.Sweat ProofYurbuds Earbud Enhancers protect headphones from perspiration, even during the most intense workout sessions. The protective silicone of the earbuds ensures that rain or extreme humidity will stay out of the headphones.