I had a Idea a few years ago. Why not Keep warm !! We know a good amount of heat is lost via the head . Why not stop it ! I have had various ideas from Lycra suits with heaters to water loop heaters. After 4 years of nit picking at the idea I decided to make a real one . I moved to Iowa from LA Southern Cali . Its Cold here . VERY cold . little cali guy can't take the cold. so I made last year a Lycra vest with a embedded 7.2V heaters in it . It was OK but was a nightmare to wear as it looked like a bomb vest . So I decided to rethink this time how I kept warm .