Sure, you can buy hand warmers in the store or online, but cost per use can be quite high and performance from those small packages can leave you wishing for more. What if we told you there was a very inexpensive way to make your own hand warmers with common products and a few seconds worth of your time? Please keep in mind when adding calcium chloride to water, hydrochloric acid and calcium oxide form, so you must be careful not to get this mixture on your skin because it can cause the skin to burn. With that being said check out this excellent video by kipkay: