How does a mattress-in-a-box like this Sealy Cocoon get set up?

It arrives roll-packed and compressed in a box for easy handling. Place it on your foundation, unroll it, cut away the plastic, and let it expand and breathe. Memory foam needs a little time to reach full height and firmness, so give it a few hours to a day before sleeping on it for the truest feel. Built in Ontario and shipped within days, it expands fresh rather than after months compressed in a container.