Windbelt powered heated jacket
After reading about windbelt and looking at prototypes designed by some folks here I have got an idea. Basically use windbelt to recharge a battery -I believe li-ion polymer battery is the lightest. The battery in turn can be used to heat a jacket. Idea is to use carbon microfiber sheets which heat up when electric charge is supplied by the battery. A battery wont last long so it is important to focus heating the core- heart and lungs. If these parts are very warm that the body will divert heat to warm other parts.
If you are an ultra light hiker or a racer and travel in cold windy places you will understand how cool this thing would be. Down/synthetic insulation is bulky -Now just imagine the bulk of warm sleeping pad and down/synthetic insulation gone from your pack.. This could be a possible future.