I always thought that Truly Wireless Headphones would fall out whilst running however these are designed to withstand intense workouts and fit securely in your ear without falling out.   If you happen to forget where you left the headphones, the dedicated JVC Headphones Manager app will help you locate them, which is convenient.   The charging case is much smaller and lightweight than I imagined and easy to carry with the added benefit of a belt clip.   Like the AE Series headphones, these are sweat and weather-proof and being able to wash them after use is great!