These Warmers are For Real
I have no affiliation with this company, these warmers are the real deal.  Three levels of warming (never use the highest), I play golf early mornings and if I do not have warm hand that thin 4 iron I hit will completely numb my hands.  I play in temperatures down to 25 degrees F, 3times a week.  Since discovering these warmers I do not dread the early morning rounds.  My wife likes them for when we go on late afternoon walks as well.  I have 4 of them, one for each hand for my wife and I.  The extra bonus is that they can be used for recharging devices like your smartphone, tablet,  ear pods, etc.  9000 mAh should recharge a smartphone approximately 3 times.
Rating: 5 stars