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Designed to eliminate cold spots and ultimately keep you warmer in the backcountry without adding weight, this ultralight jacket features two-layer ThermoBall™ insulation. Round Thermoball™ powered by PrimaLoft® clusters trap and retain heat to achieve phenomenal warmth in cold and wet conditions. Finished with ample additional insulation (100 g) through the water-resistant nylon ripstop neck, shoulders and outer sleeves.
Developed in partnership with Primaoft, Inc., ThermoBall is a revolution in insulation technology. Unlike traditional continuous-filament synthetic insulation, the small, round PrimaLoft synthetic-fiber clusters closely mimic down clusters, trapping heat within small air pockets to retain warmth. Independent clo testing by Kansas State University has shown that ThermoBall has warmth equivalent to 600 fill goose down. As a result, ThermoBall can offer the lightweight warmth and compressibility of down with the wet-weather insulating performance of synthetic insulation.