The headphones fit securely and comfortably, even during intense swims. The sound is surprisingly clear and powerful for waterproof headphones – rich bass and clean highs, so you can enjoy your favorite music even underwater. The short cable is perfect for use with a music player on the goggle strap – nothing dangles around annoyingly. The build quality also feels very robust and high-quality, and you get the feeling that the headphones will last a long time. I particularly like the fact that different eartip sizes are included. This allows for a perfect fit, which not only ensures comfort but also improves the sound. For anyone who doesn't want to miss out on music while swimming or doing water sports: an absolute recommendation!