Unmatched Sennheiser Sound: Enhance your performance with high-quality Momentum Sport sound and stronger bass. Adaptive ANC: Stay focused without distractions even in noisy gyms or busy outdoor locations. Integrated biometric sensors: Accurate measurement of heart rate and body temperature through precise in-ear sensors. Connectivity with the sports ecosystem: Compatible with leading sports watches, apps, and fitness devices thanks to Bluetooth. Semi-open design for increased comfort: The acoustic relief channel allows for air circulation, enhancing comfort, reducing body sound, and improving natural perception. Powered by Polar: Complete Polar integration and free access to Polar Flow for seamless tracking of your key biometric data. Secure fit for any sport: Interchangeable ear fins and adapters provide a secure, customized fit with lasting comfort during long training sessions.