Textiles for heating
It is better to use fabrics than cold insulators than those that heat. In the United States Gateway Technologies sells gloves, caps and boots that heat the person without external energy sources. These products, of great utility in winter, are based on “materials that change phase”.
In other words, certain chemical compounds such as polyethylene glycol, etc., are used. When the temperature is high, store the ambient heat during liquefaction and then, when cold, solidify, contributing between 35 and 45 calories per gram.
To prevent fluid from laughing in the tissue, these chemical compounds are found in small ball-shaped capsules between the tissue fibers. It is true that periodically the fabric must be kept warm (that is, it must be loaded as the batteries), but the sweetness it gives when it is ice is not precarious.
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