I used these ear plugs in the shower because I didn't go swimming yet, however, now I fully intend to when I get the chance. They blocked all the water from entering my ears. Also, I played music in the background to see how quiet they get and they blocked the music as well. I recommend these if you have sensitive ears to water. They also came in a small case which was helpful so they can't get lost. The only issue I did have with these, but I'm sure all ear plugs are like this, I was having trouble putting them in my ears at first, I had to get used to doing it. After I practiced though they fit in perfectly.