I used them on my son and they worked well for us once we ditched our old pj bottoms. With the old pjs they would leak almost every time but I'm sure that this was because they were sooo tight that the fabric would creep inside the pant and wick out moisture (they are indeed quite bulky). Instead we got a pair of pj bottoms that were two sizes bigger *and* made out of fleece and our problems were solved! The bigger size was too long but I just rolled the cuffs and they fit much better at the bum. Plus fleece doesn't absorb so they could wick moisture even if they did creep inside.

Don't know if this would be everyone's experience but even if it yours you can almost surely fix it with a bigger size pj bottom and maybe one made from fleece (or wool if you're so inclined).

Karen.