The HyperDown collection was engineered with low temperatures and high altitudes in mind. The insulation blend with Cross Core™ Technology pairs the warmth-to-weight superiority of down and the compression-resistant performance of synthetic insulation for the ultimate lightweight defense against wintry conditions. The top-tier warmth and packability is wrapped in a durable ripstop face fabric for the ounce-counting hunter who isn’t deterred by frigid cold and harsh environments. Built to be light and packable for the ounce-counting big-game hunter on their coldest hunts, Kelvin HyperDown Jacket is the warmest puffy SITKA makes. Made with 800-fill PrimaLoft® Gold down blend, the insulation resists clumping in wet conditions maintaining warmth when you need it most. A 27D ripstop face fabric makes the jacket as tough as the conditions it is worn in, and it is cut to fit over your other layers and optics harness for rapid deployment. FEATURES: Paramount warmth for every peak Positioning Statement The warmest insulation layer for big game hunters who don’t let the weather slow them down Built to fit over your other layers Zippered hand pockets Two interior mesh dump pockets to warm socks, liner gloves, or other accessories Adjustable brimmed hood and hem Elastic cuffs Insulation: 800-fill power PrimaLoft® Gold down blend with Cross Core™ technology, 90% down, 10% synthetic Construction: 27D ripstop polyester face and 10D ripstop nylon lining resists snags and tears Weight: 1 lb 4.6oz / 583g in Size L MPN: 600402