I think that this extra step really helps hold in the moisture and it just makes your roast look pretty, too. (lanascooking.com)
It does effectively hold in moisture and protect skin, or any other surface that it is covering, from the external environment. (crappypictures.com)
Despite a few accidents, these cute toddler training pants hold in moisture pretty well so that I can change her after an accident just like I would a cloth diaper. (mommyscene.com)