Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: What is shelf life of warmer a?
Document: So there is a trade-off when choosing hand warmer chemistry.
The size of the warmer is good and it gives off a lot of heat.
My husband and grandson work on a golf course-these come in very handy when the temperatures drop. They both liked having them in the cold weather. Also bought the Zippo hand warmer-which is pretty neat too!
I LOVE these things. I have used them skiing in my gloves and boots but we went snowmobiling this past weekend and they were perfect for my gloves - my right hand warmer on the handle wasn't working and it was about 2 degrees out so these were a lifesaver.
It takes a little while before the hand warmer gets hot, but once it does it'll keep your hands nice and toasty. You may have to shake it every now and then to reactivate it and get it hot again, but other than that it does a good job keeping you warm during those cold, cold days.
Okay I don't know if I just didn't look close enough but these suckers are TINY. I mean each 'finger' warmer is less then the size of a tea bag. Also each warmer takes 30 minutes to activate. Only upside is that they last for 6+ hours.
I'm on my 2nd batch. They do work but I wish they would get a little warmer. Some seem to work better than others. I follow directions and use them in pockets and gloves. I also take them out occasionally and shake to infuse more air.
I bought this product to use on a fishing trip to the state of Washington in April. The hand warmer packets did not get warm enough to do much good with temperatures in the 40s and 50s. They were kept in our pockets but still did not provide sufficient heat to be worthwhile.
I used these 6 different times for cold weather fishing. I placed them in my coat pockets; outside temps around 25 degrees. They just stayed luke warm and could not keep my hands warm. I have to reactivate them several times. Maybe they work better in warmer temps. Not a good product for me.
These are ideal gifts for anyone because who can't use a pair of these, stashed away in your glove compartment for an emergency? (southern folks, excluded!) I wrap ribbon around 2 to 6 of these & give them as small holiday gifts. They are also handy to have for hikes on chilly days and for providing to out-of-town visitors from warmer locales before embarking on any winter adventures.
Answer: yes