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In the Colter Jacket, Sun Mountain uses patented 375 premium insulation, which makes you more comfortable by helping control your core temperature. The insulation retains body heat, while 27.5 active particles embedded in the insulation accelerate vapor movement and prevent overheating and moisture build-up. Strategically placed stretch panels provide freedom of movement. The overall result is a multi-use, comfortable, ultra-lightweight technical piece that is warm, without the bulk.