Polk Audio UltraFit 500 Mid-Flange Earphones : To get the most out of your workout, your headphones must stay put in your ear and provide you with awesome sound quality. Polk designed the Ultrafit 500 sport earphones to fit uniquely and safely in your ears. These sport earbuds lie in the mid-flange area of your ear canal and hook around your ear. This positioning means the earphone sits in the middle of your ear exactly where you need it and endure the harshest workout conditions. Polk Ultrafit 500 earbuds can even withstand sweat with their moisture shield technology that resists any wear and tear. UltraFit 500 Features: 1. Ultra-high performance digital sound, focused details, full fidelity and deep bass. 2. SecureFit support keeps your headphones comfortably in place. Ultra-flexible tangle-free planar audio cable eliminates cable tangle. Two easily-switchable custom lengths included, including a 14-inch length specifically for iPod nano, iPod Shuffle and other MP3 sleeve and collar connections. 3. StrainGuard Kevlar core technology and computer-designed transitional connections eliminate cable failure. 4. Moisture shield technology deflects and resists moisture, for peak performance through the most strenuous activity. 5. Reflective safety wrap for improved visibility. 6. 3.5mm connector is designed to fit through the opening on all i-gadget cases. Engineered for durability, performance & comfort, and made with the most advanced materials and headphone micro-technology, to be the last pair of sports headphones you'll ever need.