Colter In the Colter Jacket, Sun Mountain used a patented 37.5 premium insulation, which makes you more comfortable by helping control your core temperature. The insulation retains body heat, while 37.5 active particles embedded in the insulation accelerate vapor movement and prevent overheating and moisture build-up. Strategically placed stretch panels provide freedom of movement and allow for a leaner cut. The overall result is a multi-use, comfortable, ultra-lightweight technical piece that is warm, without the bulk. FEATURES Strategically placed stretch panels for playability Insulated panels keep your core warm Stretch panels allow for a slimmer fit Adjustable, insulated hood Four pockets including internal and external chest pockets. Keep your game sharp with this reliable, comfortable, and stylish gear — made for modern golfers who want performance with personality.