Our foundation provides excellent support under any Casper Sleep mattress and can be assembled in minutes no tools required. It can also be quickly disassembled if you are moving or need to manoeuvre around tight corners. Older box Springs slats tend to be too far apart, leaving room for mattresses. Our foundation's slats are positioned a perfect four inches apart for optimal support. Engineered with solid wood, it has been rigorously tested for durability and proven to stand up to years of sleep. Similar to a house, a mattress needs a foundation as a strong base to support it. The function of a foundation is to provide support for the mattress and ultimately extend the lifespan of the product. Additionally, raising the mattress allows us to get in and out of bed easier - added bonus.