Hi quokka,
Welcome to the Mattress Forum! … and I’m glad you found us as well.
Hopefully after reading the previous reply your qualms have been put to rest … unless of course you are in a much higher than average weight range.
I would keep in mind that “free” return or exchange policies are built in to the cost of a mattress where the majority of customers who don’t return a mattress pay for the minority that do (see post #25 here).
Phoenix