Cold weather confronts the endurance athlete with new challenges and opens a new world of athletic options. It also requires new choices in clothing and hydration paks. Just as athletes add high-tech layers of clothing to provide breathable insulation from the cold, Nathan Snow Line paks keep fluids from freezing. They also work in harmony with high-tech apparel’s fabrics to wick moisture away from the body –– critical for staying warm. Feedback from the elite skiers on the Subaru Factory Team guided design, features, and fabric choices. Nathan Snow Line paks include features like Thinsulate® insulation, waterproof zippers, drink tube routing inside the shoulder strap, and insulated bite valve mittens.