Ergonomic Sports Design and IP7 Waterproof: The running headphones are ergonomically designed and come with 3 different sizes of soft ear tips (S/M/L), which fit most ear canal contours. The earplugs will be very comfortable and not easy to fall off when worn. They’ll also stay in place, whether through intense exercise or prolonged use. At the same time, wireless headphones has an IP7 waterproof rating, which can resist sweat, rain and minor water splashes, which is suitable for exercise, and running.