Review on H2O Audio CB1-GR Flex All Sport Waterproof In-Ear Headphones (Steel Gray) by Victoria Gomez

Simply the best fully waterproof headphones. I trained with them in the pool for years. A limitation. Never get your ears or headphones wet before putting them on. If water gets into your ear or headphones, the water will vibrate in time with the sound, which will distort the music. Those aren't bad ear pads, it's the water that got into them. Therefore, you need to keep them dry and your ears need to be dry too. That's why they have to fit well so that they don't absorb water during exercise.