OFFICIALLY RECOGNISED - The only official headphones chosen by England Athletics. Nothing in/on/over your ears. Our OPEN EAR DESIGN makes it safer for running, cycling and driving. EXCLUSIVE PACK - Includes Trekz Air and AfterShokz portable storage case. The OpenFit headphone design ensures maximum situational awareness and the case protects your favourite device from bumps dents and scratches. PATENTED BONE CONDUCTION TECHNOLOGY - AfterShokz has 150 patents worldwide. PremiumPitch+ provides a premium audio experience. LeakSlayer reduces natural sound leakage by 70%. Audrey Says guides users through power, pair, play and talk. ULTIMATE DURABILITY - IP55 certified to repel sweat, dust and moisture. Hassle-free 2-year warranty. With a complete titanium wraparound, Trekz Air withstands your most strenuous exercises and stays in place through any movements. COMFORTABLE & CONVENIENT - Equipped with Bluetooth 4.2 and 6 hours battery time, AfterShokz lightest (only 30g) headphones to date deliver unnoticeable all-day comfort and great multi-device connectivity.