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: what is the expiration date of the medium/large foot warmers?
Document: The foot warmers work well as designed. My only complaint is even though they are med/lg. they are still rather small for a mans foot and they move around in my ski boot.
I ran out of the competitors foot warmers and ordered these expensive expecting the same or better heating while shoveling/snow blowing this miserable winter. But they barely heated my feet and lasted just 4 hours. Would not order again
I have a medical condition that requires me to take an electric blanket, hot water bottles, and these foot warmers every time I leave the house. So I am at their mercy with the price. However they do the job.Galatians 2:20
I think they are expensive... If you are in extreme cold weather, I recommend a solid pear of wool socks, good boots and top it off with the foot warmers and you will feel fine. I RATE 5 STARS BECAUSE THIS IS THE BEST OF ALL THE WORST FOR THE EXPENSIVE PRICE.
I purchased these foot Warner's for my 12 year old son to use while we were hunting. Before he used these, his feet were always cold and he was ready to go home. After he started using these, we were able to set in the stand and he never had cold feet again. So they must work.
The only bad thing about these, as with any of these air-activated products, is that they tend to get very hard and lumpy as I wear them--not enough to stop me from wearing them, but they can get uncomfortable once this happens, especially if I'm wearing loose or worn socks that don't fit firmly around my foot. So wear very supportive socks and shoes with these, and that will help.
These warmers are better than the toe ones, but they do not provide enough heat to make a difference in any temperatures except for the mildest ones.
I have bought these warmers many times so I was very disappointed with last 2 boxes. They turned out to be unusable since they now give off a terrible oder. I hope the company will fix this problem. Also the slippery back causes the insert to move.
This product simply doesn't work. That is all there is to it. I have been doing some cold-weather bike riding (temperature below 30 F) and having a problem with my feet/toes getting incredibly cold. After trying multiple pairs of socks and some shoe coverings the last thing I could think of was these chemical warmers, I thought surely these must work. Nope.
It is possible biking shoes don't give these warmers the environment they were designed to work in. With that in mind I am going to try a few things to decrease air-flow into my biking shoe and see if I get any better results (like duct tape under the insole of my shoe to plug the ventilation holes). I will update my review I can achieve better results.As of now this product simply doesn't work.
Answer: no