I have never heard of that, but maybe that is my problem. I used to work in the oil fields, and my job had a lot of hand vibration involved. Anyway, when I started carrying a gun for a living I still had cold hands, but needed some amount of dexterity. Thick gloves were out. I ended up with some thin glove liner things, wristlets I think they were called. Very thing super fiber of some kind, covered my wrists but not the fingers. They had two holes in the bottom end, one for the thumb, the other for the fingers. The theory is that the blood vessels in the wrist are close to the surface, and get cold faster than the rest of the hand. I wore them under the black version of GI nomex flight gloves, which are, at least to me, amazingly warm, and still allow you some feel and dexterity...
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OBG