The innovative 7.5″ Bi-fold box spring foundation is for someone wanting the support of a traditional box spring. We the need for easy comfort Both during and before sleep. Unfold your Bi-Fold foundation, lay it upon your bed frame and slide on your chosen mattress and you are ready for a restorative night’s sleep. Often times a traditional foundation is not always the most convenient solution. Bi-fold steel box spring offers sturdy support expected of a standard foundation with the utmost ease of mobility. The compact size lowers the risk of nicks & scrapes on furniture and walls in addition, maneuvering traditional box Springs on stairs, small doorways, around corners can be difficult. Bi-fold box spring is the leading foundation in comfort and design, shipping flat also saves on expensive delivery costs.