The standard height of the box springs in our hotels is the 9 inch height. If you are not wanting such a tall bed it might be wise to choose the 7 or 5 inch option. The 5 inch option is considered to be a more modern or low profile choice. If you have a platform bed a box spring is not necessary. Please keep in mind if you have a bed that requires a box spring it must be the matching foundation or it will void the warranty that Sealy provides.