The Celsius is the whitetailer’s puffy jacket. But instead of the crinkly fabrics found in most technical insulators, its baffles of PrimaLoft® Silver Hi Loft Insulation are sheathed in an ultraquiet, durable Micro-Fleece. It’s ideal as a mid layer, but you can also use it as an outer layer, letting you stack and shed to keep pace with the Midwest weather.