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: I have the 4" sleep innovations.   Has anyone had the 4" and bought an 8" or 10" after that?  IS THERE A GREAT DIFFERENCE IN COMFORT BETWEEN THE 3?
Document: INSTEAD OF SPENDING $3000++++ ON A TEMPURPEDIC! YOU DEFINITELY WANT TO BUY THIS BETTER FEELING AND COMFORT SLEEP INNOVATION MATTRESS AND PRODUCTS LIKE THE DREAM-AWAY MATTRESS COVER! IS IS UNDER $500 AND IS BETTER FROM WHAT I CAN FEEL AND OTHERS I HAVE READ FELT CONCERNING MATTRESSES! THE SLEEP INNOVATION 20 YEAR WARRANTY MATTRESS IS TRULY THE BEST PRICED AND QUALITY MATTRESS ON THE MARKET!! DON'T WASTE YOUR MONEY ON ALL THESE NONSENSE MARKETED MATTRESSES!
AMAZON IS ALSO AN AWESOME COMPANY PROVIDING OUTSTANDING CUSTOMER ASSISTANCE AND SERVICE TO GET THE PRODUCTS TO US TIME AND TIME AGAIN WITHOUT NEARLY NO DELAYS OR ISSUES AT ALL! THANKS AMAZON THE GREAT! !
Very comfortable bed, I bought it for my kids and I do have the original Temperpedic bed that costs 4 times more than this one. I will definitely recommend this to anyone looking for a great deal.
I bought two of these Sleep Innovations 8&#34; Sure Temp Memory Foam Mattresses. Albeit we were sleeping on air mattresses prior to receiving these we are very impressed thus far. These were bought in Full size for our two young children because of the price point, the previous reviews, and the fact that the kids will grow into them without the need for getting larger mattresses.The fun part was opening the vacuum sealed bags that were mailed to us days after ordering.
It felt good initially. Very firm. However as winter approached and the house became cooler, the mattress turned to concrete. Too hard even for me. But that in itself wasn't the problem. The problem is that Tempurpedic's memory foam is too heat sensitive. The mattress would initially be hard as a rock, but would soften. The cloud is an 8" mattress with 4" memory foam, an inch of soft eggcrate, and 3 inches of firm support foam. Sitting on the cold mattress shows the problem.
The sinking doesn't stop until several minutes later when you pretty much made it through the memory foam and egg crate. You may have sunk 4-5 inches into this mattress. Way too much.A mattress which sags in the middle is the worst for a bad back, especially if you sleep on your stomach. The Temperpedic ends up doing this. A person's middle is heavy and gets hot under a blanket and slowly sinks all night.
the only difference is the sleep innovations bed isnt $3,000.
The end result is that your middle sinks way down, but feet and head dont. It acts like a sagging mattress. Add in partners movements and it makes for an unpredictably soft saggy mattress.Enter the Sleep Innovations 8" mattress. I emailed their customer support and they kindly responded. ILD is the industry standard measure of mattress firmness.
I ordered the Sleep Innovations 8-inch mattress based on the other reviews on Amazon, and am so happy I did. The mattress is fabulous: I don't think I've ever slept on a better one, anytime, anywhere. And shipping was blindingly fast. I ordered it late Wednesday night and received it on the Friday the same week, even though I'd only paid for standard shipping.
I contacted sleep innovations to see which mattress would be softer, the 8" or 12". After several emails, I was informed that the 8" was. I ordered it. If that is the softest, I can't imagine how firm the 12" mattress is! The 8" mattress feels like a rock! I am so disappointed! If feels nothing like memory foam mattresses we tried out in stores. If you like sleeping on a rock, you'll love this. If not, don't buy it!
Answer: I have the 4.5" on my sofa and the 8" in the camper.  To me (150 lbs) they are both comfortable and I cannot feel anything through them.  My husband (250 lbs) does not like the 4.5" because he can still feel the bars on the sofa.  On a flat surface like the floor it is ok, but the 8" is more comfortable.