At first I thought they were a bit small for our Pack N Play mattress and our mattress was getting weird. I ended up stretching them as best I could, and then they fit better. Another thing, as other people have mentioned, is how long it takes to dry. I don't think there is anything you can do about it because they are waterproof but I wasn't expecting the material they used. I thought they were like a mattress pad or a fluffy diaper, but they're like a thin layer of rubber or something. We hang ours in the shower after washing to drain, but you have to twist them in. several times because all the water just sits in a puddle because they are so waterproof. Since there are two of them in the set, it doesn't matter, we'll just delete one at a time. EDIT: I stopped using them because after a few tries they are too tight causing our pad to wrinkle and have a bulge in the middle. We've never tumble dried, I've tried stretching them at every angle and even cut the elastic off one to see if it would loosen. They're amazingly soft and waterproof - very comfortable as our little one burps a lot - but that fit didn't work for us.
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