hi catherine, i use a mixture of terrt flats and mcn. i was using the horrible pvc pilchers but bought 2 MotherEase Airflow PUL covers from DarlingsDownunder. I haven't used them yet but am going to use one tonight over a terry flat. i will let you know how it goes. I have also just ordered a Tots Bots fleece cover for overnight use as they are aparently better overnight than PUL. Anyway i will let you know how i go