Sennheiser's new SPORTS headsets are the perfect fusion of sound, performance and ergonomic design for people with a passion for sport. Six models were developed in conjunction with commissioned university studies researching the impact of extreme movement on sound, comfort and fit. High tech materials were carefully selected to maintain comfort, water resistance, durability and hygiene. New drivers were developed to deliver excellent energizing sound. Oval cables are employed to significantly reduced noise. All models include an integrated smartphone remote and microphone allowing for easy control of volume, tracks and calls when exercising. The CX 686G lets you make the most of your time at the gym. An innovative Slide-to-Fit mechanism ensures these earphones sit securely and comfortably so you stay focused on your workout. New high-output drivers deliver dynamic sound to inspire you to new levels of performance. The ear canal design lets you enjoy your favorite music without distracting background noise. Lightweight yet robust, the CX 686G is rugged enough to withstand the punishment of daily workout use. Sennheiser's CX 686G lets you focus on achieving your personal best performance each and every time. They're the best training partner you'll ever have!