The North Face ThermoBall™ Micro hoodie's innovative hybrid design sees it offer optimal core warmth in a lightweight and breathable jacket. The North Face's ThermoBall™ technology is powered by PrimoLoft® synthetic insulation and traps heat in the jacket to keep you toasty, while the lightweight, stretchy Apex Aerobic fabric to the sides and sleeves makes the soft-shell jacket breathable and comfortable. Insulated padding to the shoulders aligns with pack strap placement for maximum comfor..