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Battery Heated Clothing
Basic Mechanism
Heated clothing works by running an electric current through a certain length of resistance wire that's been embedded between the apparel's inner layer and the outer layer. The resistance wire or heating element provides a resistance to the flow of electricity and generates heat. An example of this is a toaster. When the electricity flows through the heating elements they heat up and after a minute or two you have toast. Of course heated clothing use a lot less electricity and the heating elements do not get red-hot!

Power Source
Flow of electricity can be provided by a battery or alternative power source (connection to motorcycle battery). Some batteries allow fine control over the heat being produced; others don't allow any control at all or are not rechargeable.


Wiring
Another distinction between different brands and clothing types is the kind of wire used. Some brands use single stranded copper wire which is prone to breaking due to metal fatigue, others (Mobile Warming, for instance) use ultra-fine stainless steel wire. Stainless steel is not only more ductile, it allows some stretch (up to 25%) before breakage. Add to that the fact that the stranded wires (up to 6) are insulated with Teflon and the result is a practically unbreakable heating system.

Far Infrared Radiation
Moreover few products in the market use the far infrared (FIR) technology to provide the necessary insulation. FIR is the same method through which sun heats up the earth and is rapidly rising in popularity due to its safety features and physiological benefits.

Battery Type and Wattage
Two important features to look for in battery heated clothing are the wattage of the batteries and battery type. First there are some battery powered heated gloves that use alkaline batteries. Some heated clothing use two or three "AA" style batteries or one "C" or "D" cell battery to heat the clothing.

As a general rule, products using alkaline batteries have a very limited heat output, and because of that the heated area is small. Usually they provide 3 watts or less over a small area.
Some manufacturers use rechargeable nickel metal hydride (NiMH) battery. Generally they have better heat output and more heated area, but they do not heat for long. This is due to the limited amount of electrical energy available in the battery.
A few manufacturers use lithium ion batteries, and these units generally pack a lot of heat over a broad area, and have good run times.
Consumers should look for multiple power settings, and a tough battery pack that can
stand up to the rigors of regular use. They should also consider a power output of at least 6 watts or more.

Fabric
Heated clothing fabric should have breathable, waterproof, and wind-resistant features considering the weather condition it is intended to be used in.

Solution
An appropriate product would be the heated clothing from Mobile Warming.