The North Face Women's Momentum Thermoball™ Hybrid Jacket. Tailored to fit the body and deliver breathable warmth during active outdoor endeavors, this hybrid jacket has Superstretch FlashDry™ fleece panels placed down the side and a warm core that's insulated with ThermoBall™, powered by PrimaLoft®. As compressible as down, the clusters of round synthetic ThermoBall™ trap and retain heat within small air pockets to provide effective insulation, even when wet.