I used these for both my daughter & now my son while potty training.  The thickness makes it feel more like a diaper to them and makes them feel more secure.  My kids also like how soft they feel.

Because they are thick and absorb well, if the child just starts to have an accident, it's easy to change their underpants without having to change their entire outfit.

I was glad to find these on Amazon as I couldn't find this size anywhere locally.