Buying a mattress is a confusing and dark art, but just try to return one. One family got a $2,500 Stearns and Foster mattress that had a hand-width-sized lump running from top to bottom. It was uncomfortable. Initially Sealy refused to accept the return, because the lump was not deeper than 1.5 inches. Their’s was only 1 and a quarter. What a weird rule, right?