Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: Is this mattress a firm?
Document: Great firm mattress.Second one I've bought.It stands firm and is very comfortable. Perfect for side sleepers and very reasonably priced.
We bought this for our 7 year old. The Mattress seems to be of good quality and after many months of use doesn't show any sign of wear and tear and is still firm, (but soft enough for my kid to love it!) We are more than happy with this purchase this is a great memory foam mattress.
Another positive review for this mattress here. I read the reviews raving about this mattress. What attracted me to this mattress was the bargain price, quality of it when it arrived, the positive reviews from people with sore backs, and its comfort and quality of sleep for being a medium firm mattress. I agree with these raves...
The mattress is very firm but quite comfortable. So far there has been no problems and it's a huge improvement from previous spring mattress. However I was expecting to "sink" into the memory foam and have incredible comfort, this is not the case with this mattress however it is a good value so far. I will update my review in six months.
The 8 in mattress height works well on the twin platform bed it was purchased for. There was minimal odor after opening the box, which completely went away after 1 day or so. The layer of memory foam is very comfortable and the firm foam layer gives the right amount of support. The teenage boy who sleeps on the mattress is very happy with it.
Had my fingers crossed when I ordered this in California King size. Mostly dreading the return of this monster. At first it felt firm and I wasn't sure I would like it, however I found the firmness to be good for me. I'm 6'9&#34; and 140 lb's slim and bony. The mattress is firm and not for everyone.
After a lot of research and enquiry, I decided to buy the Sleep Innovation memory foam. This is the mattress that I was searching for long for my back paina nd neck pain issues. Its firm and cool to have a very tight sleep.The package was also stress free and was very easy to unwrap and bought it back to its real shape.
I've slept on a foam mattress for the last 4 years and its much easier on my shoulders and is much warmer so I was surprised at how much better this mattress was then even the other foam mattress I was sleeping on (it's a twin without memory foam). Its a combination of firm enough to support you where you need it and soft enough to never be uncomfortable.
Honestly, I was nervous about ordering this mattress because of some of the negative reviews here. But I did it anyway because it was cheap.First of all, I love it. It's very comfortable on a platform. It's firm, but it gets soft when you lay on it.I assumed customer service would be terrible if I needed a replacement because of all the stuff I read about measuring body impressions, etc. Yuck.
The mattress could have been a perfect buy, since it was not expensive but we found it to be very comfortable to sleep on, firm but still comfortable somehow. On the one hand, the foam material has a big advantage for me, as I dislike coils, their wobbly feel and sounds. On the other hand, the foam material poses a big problem, as it seems to absorb heat, which accumulates during the night and causes me to wake up.
Answer: I bought this mattress for my 17 year old son, who sleeps on it. I asked him if the mattress was firm. His response was that it is supportive. He is 6"1"", 175 lbs all muscle. He likes the mattress. I am the same height as my son, but 25 lbs lighter, and I think the mattress is a bit less firm than the firm latex mattress I sleep on. I like the give in the sleep innovations mattress; my wife prefers the greater firmness of our latex mattress. Hope that helps some.