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Set yourself up for a great night’s sleep with the Mainstays 9 inch Smart Box Spring. Offers the look and functionality of a traditional box spring but made from steel providing ultra-sturdy support for any innerspring memory foam or combination mattress features a 100% polyester white jacquard covering that prevents shifting. This innovative box spring is designed to easily fold up for convenient storage and transport when not in use. The Mainstays 9 inch Smart Box Spring sets up in seconds with no tools required and is available in Twin Twin XL Full Queen King and California King sizes to create the perfect sleeping platform in any bedroom.