These gloves keep me warm on my runs when no amount of layering worked for me (110 lb female). By mile 1, my fingers were always freezing, even with two layers of thick gloves on. I can now wear these gloves and nothing else, and I'm still warm enough.
I especially like that you can change the amount of heat, so once I get warm on my runs, I reduce the temperature on them.
The only negative to the gloves is the size of the battery on the wrist, but it doesn't bounce while I'm running, so I can...