We have tested the swim diapers in swimming lessons and in our summer. Liquid passes through what I knew in advance. It was important that the Popo my child on the beach again soon went dry - and we did not have to constantly change diapers. What size is once happened to us, the diaper held tight. Although logical, but not to forget that one case of suspected not in the water, but look out to, so that the content remains in the diaper. The color is quickly paler, if that is relevant to someone (we have the green fish).