The versatile ThermoBall™ powered by PrimaLoft® insulated jacket offers ultralight, highly compressible synthetic warmth that’s contoured to fit your body and keep you warm in cold, wet conditions.
ThermoBall™, the new synthetic alternative to down.
The North Face™ developed a partnership with PrimaLoft® to offer a new synthetic alternative to down. ThermoBall™ is a revolution in insulation technology. Unlike traditional, continuous-filament synthetic insulations, the small round PrimaLoft® synthetic fiber clusters closely to mimic down clusters; trapping heat within small air pockets to retain warmth.