Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Green vs. blue.  Is one firmer than the other?
Document: The 36&#34; roller I have is the blue &#34;high density EVA&#34; and he HAS either clawed, nibbled on, etc this one which is an additional reason to stash it in a closet.
I am 177cm and 104kgs, this is a very firm piece and support my weight easily!I use it twice a day pre and post workout. I actually have herniated disc in my lumber area (l4-L5)and this one helps me with the stiffness I get in the morning.Compared to the blue one, I find this one to be more heavy-duty (although they say they are the same! not to me I guess)
I ordered this after looking at at least a dozen others and deciding that what you pay is what you get. For once, I was right :) I ordered the 36 inch blue one since it looked to be what I needed for back pain, namely High Density EVA. My physical therapist wanted to sell me one of theirs and I thought they looked cheaply made and weren't all that comfortable (one of the black models on Amazon).
It's a roller it still has its' shape (though I should be using it more.) If this is what your looking for it does what it says and it's foam all the way through as well as being firmer than a white roller.
I picked this foam roller because I wanted to roll out my muscles at home. I didn't want a giant roller like at the gym, and this roller is the perfect size to use at home. It doesn't take up too much space, and is just as effective on my muscles as the longer roller. The blue color is also nice, and the material is very durable.
I've been hearing more and more about the benefits of using a foam roller, so after checking the various reviews decided to try this j/fit 36&#34; blue model. It arrived a week ago and I've been using it most days, doing the basic roller exercises (is that the right term?) for legs, hips, and upper back. I didn't know what to expect, but the benefits of the myofascial muscle massage are better than I expected.
I was diagnosed with IT band syndrome. I researched for months before I committed to buying a foam roller. The reason for this was because I was told that the different colors mean different densities? I didn't know this, so I was scared to buy the wrong color and suffer. Anyways, I LOVE the size and portability of my foam roller. I got the blue color. I even traveled with it and it wasn't bulky. It's a perfect size for me, too.
A friend of mine suggested purchasing a foam roller for my iliotibial band issue. I did some searching and found this model. Purchased it and have been in pain ever since (which is a good thing). This foam roller is firmer than my eight dollar model, which helps work out the muscle in my thigh. I have been pleased with it so far.
I am completly satisfied with this high quality foam roller. It arrived quickly and was well packaged. I love the green color and texture compared to the plain white ones.
This product was recommended by Dr. Ben Kim of Canada. I subscribe to his news letter and he had done the evaluation of this product vs other similar ones. To find out various forms of exercise visit his web page at info@drbenkim.com
Answer: yes