Innerspring mattresses, particularly older models, usually need a box spring. It improves airflow, gives extra support, and helps absorb shock. Skip the box spring for foam and hybrid options. Not only do they not need them, but using certain box springs can also void your mattress warranty since the coils of a box spring can damage the foam’s soft surface.  Purple offers a better option – get a Purple bed frame instead. Purple bed frames provide a well-designed surface that results in better sleep and improved mattress longevity.