Modern foundations have largely shifted from actual springs to rigid frames.
Often called "bunkie boards," these provide support without adding significant height. 2. Pick Your Material how to buy a box spring
Best for mattresses over 12 inches thick to keep the bed at a manageable height. Modern foundations have largely shifted from actual springs
Generally more durable and affordable. Many "smart" metal box springs, like those from Zinus (at Amazon ), are rated for up to 3,000 lbs . are rated for up to 3