Fits exactly into BabyBay original, has a good comfort, stable material, the coating without problems possible and wash it warps nothing. Regular airing needs to be, because the mattress indeed rests on the continuous Bret, but this is due more from the Kosntruktion of babybay ago. All in all, very satisfied and full marks (even if the price compared to other mattresses is rather high. But that's okay, I think.