These ergonomically fantastic, acoustically driven headphones offer an unequaled level of convenience and fidelity for professional athletes, runners, and music enthusiasts. The patented Ear-Lock technology ensures a secure fit, even at severe activity levels. Yurbuds - Ergonomically BrilliantYurbuds Earbud Enhancers offer an unequaled level of convenience and fidelity with a fit that makes sure the earbuds stay in your ears, even during the most difficult physical activity.Ultra-Soft Convenience and Extreme Fit GuaranteeLight and Extreme style Yurbuds Earbud Enhancers ensure an ideal fit. Made from ultra-soft medical grade silicone for severe convenience during extended listening periods.Richer AcousticsYurbuds Earbud Enhancers are scientifically proven to improve sound quality and deliver deeper, richer acoustics. Enjoy music and the world around you like never ever before.Bluetooth DevicesYurbuds Earbud Enhancers work with Jawbone ICON & Jawbone Prime headsets and are scientifically proven to improve the sound during your calls.Universal CompatibilityYurbuds Ironman Series headphones deal with mp3 devices consisting of Apple iPod, iPhone supporting a market standard 3.5 mm (1/8") gold plated stereo mini-plug for wide-ranging compatibility.Designed by a TriathleteAvid triathlete Seth Burgett, CEO of Yurbuds developed the award-winning idea for customized fit earbud enhancers while participating in an Ironman competitors. Yurbuds Earbud Enhancers were created for the human ear by professional athletes, audiologists, and engineers to stay in location, avoid pressure points, and offer a pain-free listening experience.Sweat ProofYurbuds Earbud Enhancers safeguard headphones from perspiration, even during the most intense workout sessions. The protective silicone of the earbuds makes sure that rain or severe humidity will avoid of the headphones.