Hi Indus,
As far as I know the Dreamfoam 12 in 1 is only fulfilled by Dreamfoam (not Amazon). Amazon does fulfill some of their other mattresses (including the Ultimate Dreams latex) which means that they are subject to the Amazon large item return policy (see here) and have 2 day shipping for Amazon Prime members.
Dreamfoam fulfilled orders don’t have a return policy but do have the TMU bonus and the 12 in 1 mattress can be customized in 12 different ways after a purchase so it’s unlikely that someone would want to return it when they can customize it instead if they prefer a different firmness level.
NOTE ADDED: If you order from the Dreamfoam site instead of Amazon then there is a 45 day comfort guarantee (see the bottom right hand corner).
Phoenix