Bought them for my son who is prone to ear infections so that he could take swimming lessons and so far they work great. In the pool 1-2 hours with no leaks on a hot day. They need to be applied properly to ensure a good seal, and though a little condensation did develope inside, they kept his ears dry. Can also put silicone plugs or cotton balls in ears underneath if you want. He uses them in the tub as well.