Fireball Lite Men's Jacket Blue from Montane is perfect as a middle layer on the coldest days or as an outer layer on slightly warmer days, as it is both heat-regulating and insulating. The jacket is warm, breathable and stretchable, which is why it is perfect for an active lifestyle regardless of the season. The jacket is designed with Stretch Thermo Grid on the sides and under the arms, which provides good freedom of movement while your body temperature is regulated via. an airy outer shell. The jacket is also designed with an insulating hood, which provides good protection against wind and weather for your head.