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: what of the dimensions of the chair pad?
Document: I purchased this for a mesh office chair that was not comfortable to sit on for long hours. Since I work on a computer all day, this chair pad is perfect. It fits my office chair and allows me to keep working thru some long days. It was a good purchase.
**Update (written after having this cushion on my desk chair for 4 months):  Very disappointed at this point. This pad is now flattened out and really not comfortable. I feel almost no cushioning at all at this point. I am about to search Amazon for a replacement.. sigh.. my original review is below. It all still holds true except that cushioning does go flat after just a few weeks of use.
This chair pad is everything I expected. I love it, literally. I had been using an old cushion that had no lift at all and was too big for the chair. It had moved every time I sat in the chair. None of that now. I have more comfort than before for an affordable price. My little office chair is black and this pad sits on it perfectly. I even like the way that the black fabric gives the look of suede.
Do keep in mind that I am a writer and I sit at my desk several straight hours per day. But still. The life of this cushion was just too short, even at this reasonable price.My original review: 5 starsMy desk chair is an antique - made of hard wood. I purchased a foam pad at "Bloodbath and Beyond" a couple of months ago, it had ties to hold it to the back of the chair and within a week one of the ties had torn loose.
This is a nice quality pad, thin and secure, but the color ended up being too purple for my needs.
First of all it is not 2 inches. It is very thin and after my big ...... sitting on it the pad is now about 1/2 inch thick. It is now useless.
Since this is a pad and not a pillow, it works really well for a good while, then it becomes kind of flat...I just put a folded blanket on it and it works just fine.
Pads are about 2 inches thick. That is about an inch thinner than other pads we have owned. We think they look better that way. Less like a pillow and more like a pad. The color is actually a little darker than shown. Which for us works great. We have owned them about a month now. No problems. Pad  s do not not slide. Comfortable. Good looking. Well made.
This producr was exactly what the description said it would be. This pad is made from a nice foam. Some sites have described the Brentwood pads as "memory foam" but Amazon's description is honest. The cover is soft and so far any dirt has been easily brushed off. The dots on the back do hold the cushion in place, but don't expect them to keep this thing still if you have a squirmy child using it.
Like some other comments, this pad stays where it's placed due to the non-stick, but adhesive-like dot silicone underside of the cover. And, following extensive use, the pad maintains its shape w/o deformation that would normally happen w/a pad of this type. Nutmeg color makes it compatible with most settings. Faux suede produces a great feel.
Answer: The dimensions are, length - front to back is 15 inches. The width across the narrow part back of pad is 11 inches and at the widest part at the front it is 18 inches.