In 1848, a worker at Sutter’s Mill in the foothills of the Sierra Nevadas struck the vein of precious metal that would set off the California Gold Rush. It just so happens that you’ve discovered a gold mine, too – a real mother lode of temperature-taming function! This jacket’s advanced Thermore® Thermal Booster insulation works harder as temperatures drop, providing up to 20% more warmth in cold conditions. Even better, the Temp Tamer lining contains active particles embedded in the fabric that keep you in your comfort zone – removing sweat to cool you without feeling wet or holding in heat to maintain your ideal core body temperature in cold conditions. Handsome and practical quilt stitching secures the 90-gram polyfill insulation – creating a trim layer that manages your body’s microclimate, yet never gets in the way of work or play.