100% Waterproof H2O Audio's patented waterproof technology allows headphones to withstand heavy perspiration, rinsing after active use, and submersion to 12ft/3.6m underwater. Personalized Fit Includes 5 sets of Elastomer earplugs (XS-XL) to ensure a secure and comfortable fit while paddling, running, and working out. Hydrodynamic Design Ergonomic sheared shape sits flush with the ear and is designed to promote proper alignment of the earbud with the ear canal for superior sound and less drag in or out of the water. Improved Bass Amplified Sound The latest waterproof technology delivers improved bass quality, while sound-isolating, watertight earplugs provide warm sound and dynamic bass response powered by Surge 2G’s waterproof 8mm neodymium drivers. Sportwrap Neckband Ergonomic neckband actively manages the headphones coiled cable and delivers a stable fit. Sports Performance Precision engineered and individually tested to deliver high quality fit, function, and durability for long-lasting performance.