[Seeker]

Here's the quick take:

The Gerbing liner produces high levels of evenly-distributed heat that's very comfortable and soothing.

It has a heated collar that seals well against the cold and warms evenly around.

The heated sleeves are very effective, surrounding your arms in warmth. It's also windproof and has Thinsulate insulation to keep the heat in.

Those are the basics.

I've got a full review at:
Gerbing Heated JACKET LINER Review
http://pages.videotron.com/mcrides/product_evals/gerbing/liner.htm
:

[cb900c]

I rode for over twenty years without heated gear. I tend to ride even if it is in the 20s. Until I used the heated gerbings jacket liner, I always lost body heat after 30 minutes or so. Now with the heated liner and gloves, I can ride all day in comfort. Get the liner, not the vest. Full sleeves are the way to go.

[dattaway]

I used to get burns with the Widder suits and still be cold.

The Gerbing liner is the best motorcycle accessory I have below my helmet. It lets me ride in any weather. The incredible heat keeps me dry in the rain. Why motorcycle shops don't carry these, I don't know.

I've had my liner for 5 years. Best money spent!