So I decided to try these out to make sure they would work before putting phones in them. I put some paper towels in them, closed them, and ran water all over the case. I could see that they were still dry inside so I went ahead and submerged them in water to see if they would keep holding up- they did!! The paper towels were dry and now I know I have a great pair of cases for water parks and muddy 5ks this summer- LOVE THEM!