i use the BBH pul covers at night as they are all I currently have. I have not had any issues with DD overnight and she is snuggled up nice and warm with me under a doona at night. That said i am keen to get some longies and wool covers when funds permit. I find the bamboo next to her skin, even when really wet, has been good for her skin. Surprised me. Because of that I want to get more fitteds for day use as well.