Every hunter has a go-to jacket. "Old dependable." The jacket you always take along because its the best you have for warmth. Meet your new Mr. Reliable - the Calor Jacket with Heatwave Technology. Using advanced scientific reactions, the Calor Jacket works with your own body heat, however little that may be, to warm you beyond anything youve experienced. Wed explain further but its probably best you just try it out for yourself.