Yep your right the booster sits against the bubs butt lol. I have the itti bitti d'lish with the snap ins and they come up fine after they have had a bit of time in the sun. I find these dry a lot quicker than the sewn in nappies that I have (different brand though) I don't have a large stash of boosters just the ones that came in the nappies originally and we do fine with just those even with two poo bottoms in our household!!