The only ones that work in my ears, and I’ve tried many (for swimming, I mean). When they’re new, I shape them a little by hand and, by gently pushing them into the ear canal, they take the shape. That’s it. I swim in the pool and the sea, I dive and do whatever I want in the water without a single drop of water getting into my ears. After that, they just need a rinse with clean water, drying, putting them back in the case, and they last for many uses (30–40 times for sure). Without earplugs I had problems all my life, and in fact in one ear I also have a small permanent hearing loss because of the infections I used to get since water would stay trapped inside. Very good and the price is great.