NWR - Amazon Returns

Does anyone know Amazon´s return policy? I know that you are able to return but I don´t see where it explains if you get your money back or just credit? Also, I assume you have to pay to ship it back, right?

any help is appreciated. i´m on their site now too but i´m so out of it that I´m prob looking right at the info and not seeing it. I figured I´d post in case someone has already dealt with this. I´m thinking of getting a costume but I wann make sure i can return it if it doesn´t fit.

tia