The BBH's come with 2 boosters...a long one and a short one. Leave both of them in the nappy for night time wear. For night time use wool or fleece covers as the urine evaporates and allows your babies bum to breath. BUT if you use wool..you need to lanolise it (make it water proof) were fleece you can just wash and go. Dont get me wrong...vie got PUL covers but I tend to use them for daytime use only because bub gets more changes through the day then at night.

Hope thats helped