Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Does the zipper open from either end? meaning can I have my feet out and walk around while "wearing" this liner?
Document: Light weight, in fact a little thinner than I expected. I used it for the first time this weekend. It is instantly warm, keeps the air from getting to your body, and adds probably about 10 degrees to the rating of your sleeping bag. The zipper is really easy, maybe a little too easy, and it never jams up!It did wrinkle up around my feet a bit.
Works well for a lightweight sleeping bag for warm weather or a liner for your sleeping bag.Serves a very useful purpose. The zipper is a little big, but works fine.Worth the reasonable price I paid.
It's cheap, it's warm and it packs small.I take this with me on every camping trip for added warmth and it has served me well.My only gripe is that the zipper is pretty uncomfortable against skin and is not covered by anything. Still, it's a pretty good bag and/or liner for the price.
the material feels funky against skin, so I recommend wearing socks and leggings. Or air it out before you use it.It's super thin and light, but kept me warm in 50 degree weather. Course I was also in a cabin, so I can't say what it'll feel like with wind, rain, and a muddy floor around you. But it doubles as a blanket on my couch or floor, so yeah totally worth it.
If you want something warm this is not it. But it is compact and easy to travel around with. It rolls up tightly and is roomy. I used for traveling around Dominican Republic.
I bought this to use with my 25degree sleeping bag on a recent trip. I hammock camp and knew the temps would drop to around 30 at night and needed a little extra warmth. I stayed nice and toasty all night!
This was just what I needed to take hiking. It was light and compact, and just warm enough to use with a hammock. It's not bad for a nap on the couch either.
The bag is so thin that it is see-through. It works well for me because I got it for that little bit of extra warmth inside of my other bag on cold nights, and did not want to have to lug around anything large. Since it is so thin, it packs down really small, and is not an inconvenience to carry along on a backpacking trip.
If the zipper was a little more heavy duty I would have given it a 5, but you do have to be careful with the zipper as it seems a little light weight to me.
This is essentially a very light blanket with a zipper. I would not recommend it for outdoor camping, but it worked very well for a short road trip. I was glad I had one with me when our group decided to stay the night in a cold church building! When you pack it into the stuff sack it's very easy to place at the bottom of a backpack.
Answer: yes