If you're planning to be out in extreme temperatures, than you need the military's extreme cold weather clothing system, or ECWCS, parka and matching trousers. These trousers are made from HYVAT, a proprietary next-generation high-performance fabric. It has a special three-layer construction with micropores that provides waterproof, windproof insulation and protection against the elements while allowing ventilation and evaporation designed to help keep you from overheating during exertion or getting cold and clammy afterwards. The result is a surprisingly light weight pair of over-trousers that is excellent for keeping you warm, especially if you go from active to inactive and vice versa. La 613902997806