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: How tall is this pillow?
Document: I bought this pillow because the description promises it to be ideal for those looking for a lower profile pillow. The description claims it adjusts to the head, and it's ideal for side sleepers, but this is not the case. The pillow is 5 inches tall, and it does not give in at all when you put your head on it, so your neck tilts. It's impossible to keep your spine in line with this pillow.
This pillow is about 4 in (UPDATE: it's more like 4.5-5") tall all across the length of the pillow, which for me is perfect. The memory foam is very dense, I'd estimate it to be at least 5 or 6lb density, just enough to cradle your head/neck (unless you've got an unusual/freakishly heavy head =p).I alternate between sleeping on my back and on my side, which I find that this pillows fits perfectly.
I have been searching for a pillow that was fairly flat, not too puffy, and that gave my neck good support. Since I am only 5 feet tall, I found that most pillows were too high, and I tried a lot, giving me a sore neck in the morning. This pillow seems to do the trick. It is fairly flat but supports my head so my spine and neck align. I have not had it for a very long time, but so far, it has done the trick.
I would not buy this pillow again.
But I still need a thin pillow...
Very comfortable. Finally a pillow that doesn't give me a stiff neck in the morning.
I've been searching for this pillow for a long time. I highly recommend!
I did not like this pillow at all. it is hard. Just not what I was expecting. You may like it.
i like the pillow. i had purchased one before so it was easy to find another one just like it.
This is a nice pillow, but it's not as firm as previous foam pillows I've had, so I wouldn't get it again.
Answer: The pillow tapers to the edges as I believe the picture shows. I put it on the floor and measured from the floor up to where the edge starts. My pillow is 3 inches high to the start of the tapered edge. However, the pillow crests very quickly upwards from that point. So, I laid a yardstick across the top of the pillow to extend out beyond the tapered downward edges, and the pillow measures 5.5 inches from the bottom to the top crest of the pillow. Bottow line: 5.5 inches high, and tapers down to 3 inches at the edges. The bulk of the surface area is closer to 5 to 5.5 inches, just the edges taper to 3 inches.