Beautyrest Silver Low Profile Box Spring Brand new Includes 10 Year Limited Warranty, Sleep in comfort with our Simmons Beautyrest Silver Low Profile Box Spring Foundation 5.5 Inch Height which provides strong and stable support for all Beautyrest mattresses. This standard profile foundation helps prevent sagging and bowing for the life of the mattress when used with a supportive bedframe. It is constructed with high-grade wood and steel struts featuring an exclusive center power beam to reinforce the span in