Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Can this be used on top of an existing box spring which appears to be in good condition?
Document: Soy is such a diverse and valuable food source that it may not be used best as a plastic substitute."
Excellent mattress, good for sensitive people with allergies. Very comfortable, not too heavy to lift, fast delivery, I recommend this mattress.
It has a medium side and a firm side, but I honestly can't tell the difference. I'm not princess and the pea, and both sides are wonderful. Its encased in organic cotton, and very nice looking. I didn't want to put a sheet on it. This mattress is a very solid value from a good solid american family owned company. Shop on their site, or buy from amazon. Either way you won't be disappointed.
When you lay in it there is a very even feel to it, your mid section doesn't sink lower like it does with a spring mattress. My back was very happy in this bed, I normally do best laying flat on the floor, but this was great for me. The firm I would say is actually closer to a firmer medium, nowhere near rock status, a perfect fit.
One totally awesome bed. The bed is what I would call more towards the firm side of things, but feels really good. However, I ended up having some minor back pain when I started using this bed during the first week. Now as odd as it sounds, the pain actually felt good. The back pain felt just like when I had my back straighten out by a physical therapist some years back; felt good but sore.
I got a sizeable tax refund this year and realized it was time to buy a new bed. I've always slept on hand-me-down beds or whatever I could find that was inexpensive. It was time to do something good for myself! I researched mattresses with a fervor for about 2 weeks. I looked at memory foam and latex, read all the pros and cons of each, and untimately decided 100% latex was the way to go.Enter the SleepEZ Roma.
I got this mattress last week, and so my review is what my initial experience is.THE DIFFERENCE:Start, the difference between this and a Tempur-Pedic(Memory Foam) mattress? The latex bed has much more bounce feeling to it, there is no spring, but any indent you create is instantly filled after as you roll over, so when you roll over you don't fall back a little into the hole that was created from the first part of your night(it doesn't memorize your shape).
When I started shopping for a new mattress, it was the first time in ten years I had done so. I was appalled that most mattresses these days are not flippable. Innersprings with their no need to flip pillowtop are a sham and memory and latex foam mattresses were a few inches of memory or latex, on top of &#34;support foam&#34; (cheap filler). Even Tempurpedic.
I checked out their history with BBB (stellar, btw) and ordered this mattress from their website. I received lovely service from moment 1. I got updates via phone and email every step of the way from the folks at SleepEZ.My mattress arrived last night via UPS and I was SO EXCITED!! It was tightly compressed into a box that would fit into the trunk of a compact car.
loving this mattress.
Answer: Yes it can as long as it gives good support and does not have large gaps between wood or springs. Avoid foundations made from all metal that have large open spaces.  Although inexpensive this type of foundation reduces the life of your mattress because of improper support.