Comfort bedding Folding Foundation is a steel heavy-duty foundation that will supports your mattress and prevents it from sagging. This product is shipped fully assembled but uses a unique design that allows it to be folded flat. This will make it easy to move up stairs and through narrow hallways. Don't waste hours assembling flimsy wooden foundations that will give you splinters. This takes seconds to set up. Just remove it from the box, unfold and its ready to be used. The heavy-duty steel provides maximum durability and total support for your mattress. This Box Spring foundation works with any mattress . It is available in Twin, Twin XL, Full, Queen and in King sizes. its approximately 8" Inch in height. Comes finished in a white soft knit cover.