I think it makes sense, gortex is like that too. Keeps water out but breathes still. And if you feel the outside of something like say a wonderoo it's soft but the internal part of the pocket is the plastic pul so that means air does get in but moisture is still trapped by the pul on the inside of the pocket. My dd never gets rashes or too hot in pul but she doesn't wear it all the time either so that could be why. I'm not sure I would make it my entire stash and use it all the time but sometimes I think it's fine and has a place.