This high-tech U.S. Military Low Loft Jacket provides supreme adaptability and weather/temperature protection for your next adventure. 2-oz. PrimaLoft® Sport synthetic insulation behaves similarly to down, trapping warm air close to the body and providing warmth even when wet. But in this "low loft" configuration, the insulation provides enough permeability to reduce ballooning, and allow fast stuffing and stowing on the trail. Water and wind-resistant, too, for when bad weather raises its ugly head. Designed to rigorous U.S. military requirements, as seen worn in some of the most demanding environments around the world.