MANASTASH Plumón Monster 700 V2 Down – 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 the warmness and puffiness. The elastic waist prevents cold air from coming in and make the jacket even warmer. Both sides open for ventilation in case you need some air.