The Neutrino Pro 500 is a narrow mummy sleeping bag designed for three-season alpine use with a 15°F limit. It features 800-fill power down treated with Nikwax for weather resistance and is certified to the Responsible Down Standard. The recycled Pertex Quantum Pro fabric resists abrasion and moisture. Chevron-shaped baffles reduce weight and improve heat retention. A close-fitting neck baffle and adjustable hood prevent drafts. It includes a waterproof compression sack for compact packing.