Get the best night's sleep yet with this 4-inch mattress, perfect for your King bed. Instant Foundation Low Profile Foundation is the perfect easy-to-assemble foundation for your home. This box spring is only 4 inches high, perfect for those with a high profile mattress, or those looking for a sleeker decorative look. This box spring comes in a small box it is easy to assemble and is easy to fit in any room. Narrow hallways and small staircases won't be an issue. The instant foundation/box spring can support any mattress - memory foam, innerspring or latex - and supports it evenly throughout to prevent sagging and increase the longevity of the mattress. The wood, the cover, and all tools and accessories needed for foundation assembly are included.