Purchased the custom fitted earplugs. It took me a couple of uses to get them properly inserted (watch the video for instructions) but now that I have that figured out they are so amazing. They fit perfectly and sound incredible. I have swam 6 hours or so and they have not fallen out once. Pairs with the surge + headphones and stream 2 audio player it’s the perfect waterproof audio system. So awesome. Thank you H2O!!!