Designed to give you the freedom to move with the music, this sleek pair of wireless Denon AH-C160W headphones uses unique Earhook technology, developed with a leading hearing aid specialist, to keep the earpieces in place even during heavy workouts or when running. Three ring sizes give the best fit for the ears, ensuring pure music playback and excluding noise. The sound of the Denon AH-C160W has been designed and tuned using advanced digital signal processing to help and inspire you to achieve your fitness goals faster. They are designed to survive, as well as remain durable, thanks to their mechanical structure. Even the electronics inside are coated with Nanofics technology for IPX5/7 class-sweat resistance.