Stay warm in the Sun Mountain Colter II Wind Jacket. It features 37.5 insulation, retaining body heat as well as accelerating vapor movement, controlling overheating and preventing moisture build-up. 37.5 technology is permanent and never washes out. In addition to windproof construction, Colter is also lightweight, water resistant, and offers 4 way stretch. Design details include an adjustable insulated hood, strategically placed stretch panels, and pockets for personal items/accessories.