If you need or are looking to replace your existing boxspring or foundation, our KD mattress foundation is just the ticket. It ships via UPS, it's easy to assemble and it's strong as an ox. Available in all standard sizes. Our wood foundations were designed for use on our heavy latex mattresses where most wood foundations have gaps between the slats that are less than optimal. Our design utilizes full 1 x 3 spruce slats with a gap of less that 2 1/2" between slats. Granted it may be a bit of overkill but when you are buying the best mattress why not put it on the best mattress foundation. It also comes with a slip on cover so you are not looking at bare wood but rather a very nice bamboo and wool cover.
Just bolt the two side rails and middle support to the end supports as illustrated below.
The roll out the pre-measured slats. You will find a wood dowel at both ends. Fit the end slats into the dowel, they are pre-drilled to fit perfectly. Roll out the slats and attach at other end.
Lastly take the enclosed cover and stretch over the wood foundation starting in the corners. A small hand stapler can be used to better secure the cover under the foundation.