Amazingly the historical patent claims for breath powered heating garments do not focus on the hands which are the most needy parts of our body. Finding a way to ensure the vapor in the breath condenses before reaching the glove is also a major part of this possible development. I might have made some progress in sorting out this cold hand problem / warm gloves stop you doing your work problem. If you know someone working this summer in a refrigerated warehouse please let them know about this process, if it works it would be important to them. Thank you for your open minded attention to this. Iain