MANASTASH Monster 700 V2 Down Jacket – Black: The second edition of the Monster 700, this down jacket from Manastash is the ultimate winter warmer. Thinsulate Isolant is the superlight synthetic down that holds air like down does which provides warmness and puffiness. The elastic waist prevents cold air from coming in and makes the jacket even warmer. Both sides are open for ventilation in case you need some air.