We use it on our Graco Cuddle Cove Pack n Play, a foldable thin mattress. These sheets do NOT have elastic at the bottom like fitted sheets so they are not tight at all. You'll need to pull it quite tight at the bottom to make sure it's not too loose when baby sleeps. Also, 2 packs from a third party arrived with no packaging and the labels were faded and looked like used and washed a few times. We only washed them one more time to use them but they still looked a bit odd. They are soft but very thin and not waterproof. However, they get the job done and for such a low price, they really work.
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