This mattress in a box is one you'll either love or hate based on previous postings, comes with a 120-day money back guarantee that users have reported is easy to claim on.
This is a pre-access to their Boxing Day sale so goes until at least after Boxing Day.
In the same sale they're offering $50 off their (IMHO) overpriced sofa, $50 off their bed frames and some other things that I'm sure you'll be excited about.
If you’re returning the mattress, be ready to be stuck with it for over a month while you wait for a charity to pick it up.