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: sizes
Document: The sizes and shapes of these warmers make them perfect for carrying with me. They are well made; the clear vinyl feels very sturdy, and they are easy to recharge/regenerate,  For those concerned with value and conservation, HotSnapz reusable warmers are ultimately less expensive than single use warmers, and won't create excess waste for landfills.
these are just so cool - I will be ordering more. Everytime I show them to someone they have to have one.worth every penny because they work
Would recommend for any cold natured people.
Works as supposed to. Going to be a Christmas gift. Shipped extremely fast and arrived in good shape. Thanks, great job of getting it out fast.
When you take a break, you can always recharge them and they're ready to go again.Con: May react before you wish..I've come across a couple of times when one has already reacted in my pocket before I was able to switch them and get that good reaction heat. It may be from moving around in my pocket, I'm still trying to find root cause.I kind of wish I could score it a 4.5 because it fits my needs perfectly, with one flaw.
Well, it does everything as advertised. The reheating procedure is simple, I'm just concerned that the material might melt in the pot of boiling water, so I just put it on a submersed steamer rack while boiling. The heat lasts a good 30-40 minutes and I have reused each one at least 5 times without problems. I will see how the material holds up for next fall/winter.
We use these on our photography hikes. When taking pictures it is difficult to wear gloves. They stay warm for maybe 10min. I keep them in my pocket. The do what I need them too warm up my fingers. So overall I am happy with them. I think if I went for longer hikes I may by a different brand. I didn't want to use the throw a ways to save my carbon foot print.
We have had these leak, reharden after boiling for 20 minutes and then once used, get rock hard in minutes. They do not stay warm as long as advertised. I would go back to the throwaway packs rather than get these again.
We ended up buying the mixed pack because we could not decide what size would be best. The warmers work great, But the colder the weather the quicker they lose their heat, sounds obvious but some folk seem to think that they should perform the same no matter what the weather. We carry a few on us and leave a few in our dry bags this way we have back up.
Using these in an indoor environment they produced heat for about 30 minutes. Love the idea of reusable hand warmers, and really hate throwing away the chemical ones. I was willing to sacrafice weight and bulk for something recyclable, but they don't come close to competing with the chemical ones that last 8-10 hours at a third the weight and size.
Answer: yes