Pretty good, but not as hot as you would think...or like...
January 3, 2018
That said, work pretty well. You can't expect you hands to sweat with 7 volts ! :) Used these for duck hunting recently, about 20 degrees, no wind. Worked OK, better than just gloves ! Then put them inside a pair of flip top mittens to really take advantage of them. That worked well !
Do warm, not heat, your hands.
ConsUse with additional wind proof layer to really take advantage of them !