Widder Electric Vest product review
purchased fall 1984:

Intro:
I purchased this Widder electric vest back in the days when everything was new to me in motorcycling and ordered it with the standard on/off switch. My experience is that the heated vest worked too well. I'd spend my time clicking the switch on, roasting for as long as I could stand it and then clicking it off. Soon I'd be cold again. Much better than not having heat, but not the ideal.

Then I went through years of not riding. When I began riding again, I wondered if the vest might still be functional or if there might have been a degradation in the wiring. I contacted Widder and was reassured that there should be no problem.

This time I ordered the electronic controller to replace the on-off switch. This tiny and nifty regulator adjusts the amount of heat produced using a knob graduated from 1 to 7. Makes all the difference. Now I can set the heated vest at an intensity of 2, for example, and forget it. Turning the knob instantly adjusts the heat output.

In use:
This Widder electric vest has become my faithful travel companion. I've relied on it during many rides involving nasty weather. During cold rides, I rarely have to use a setting higher than 2-3. For unusually cold riding, I will occasionally select a setting of 4-5. It falls into my don't leave home without it category.

Bonus:
At full power, the Widder electric vest uses only 33 watts. This is an important consideration for sportbike alternators that produce a more limited output, as is the case for the 929.

check out review for: System2 electric vest with arm chaps