I wear gloves... Am I weird
Or, grow a pair?
Just connect 2 partially used PP3 batteries together (ie. short circuit them) and it will do much the same thing!
Lighter fluid producing heat but no flame? What kind of sorcerer's magic is this? (Fascinating item, OP, thanks for posting.)
I have been using this for a few years, during a cold spell when I am out playing golf... they work really well. But like some of the comments earlier you do need to get the amount of fuel you need sorted, as you cannot switch it off.