Box Springs ~ Has your box spring seen better days? Make sure your mattress has the support it needs with a new box spring from Raymour and Flanigan..The inch BiFold Box Spring by Zinus is an innovative folding mattress foundation designed for mobility and functionality. Traditional box springs are hard to .A quality box spring is essential to maintaining mattress integrity. Shop queen size box springs at cheap prices available at Sears Outlet!.The core of the mattress supports the sleeper’s body. Modern spring mattress cores, oftened “innersprings,” are made up of steel coil springs, or “coils.”.