Gloves should be matched to the dexterity requirements for comfort and safety. The digits all have their own natural thermal delivery systems:- blood.
Purchase an electric vest, they suggest...
The evidence is overwhelming, as is the data .
Conclusions:-
"The application of heat to the torso region of the body
can keep the fingers and toes at a comfortable temperature
(22–25°C) for 2.5-3 h during exposure to -15°C
air. The local effects of cold on bare hands can be
overcome, provided that there is sufficient heat supplied
to the torso."
Influence of localized auxiliary heating on hand comfort during cold exposure
Dragan Brajkovic, Michel B. Ducharme, and John Frim
Human Protection and Performance, Defence and Civil Institute of Environmental Medicine, Toronto, Ontario, Canada
J Appl Physiol 85: 2054-2065, 1998;
8750-7587/98 $5.00
Vol. 85, Issue 6, 2054-2065, December 1998
data.