Polk Audio UltraFit 500 In-Ear Sports Headphones - White Features - High Performance Digital Sound - Surprising detail and fidelity to maximize performance SecureFit Support - Exercise or play knowing your headphones will stay comfortably in place Ultra Flexible Tangled-Free Planar Audio Cables - Avoid cable tangle and unwanted microphonics with oxygen-free cables in two custom lengths StrainGuard - Kevlar core and computer designed transitional connections eliminate cable failure