Warm enough to take you anywhere but so light you’ll hardly feel it, the Atomic Treeline 2L Light Jacket M is one of the lightest All Mountain jackets you’ll find anywhere on the market. Its wind resistant and waterproof Pertex fabric will stand up to anything you throw at it. While PrimaLoft Silver insulation keeps your temperature stable, and strategically placed Thermaflect lining reflects your body heat in vulnerable places like shoulders and kidneys, keeping you warm without adding bulk or compromising maneuverability.