Zoot Men's Ultra Megaheat 1/2 Zip Jacket Body: 250g MEGAheat - 93% polyester 7% spandex Inset: 140g ETHERmesh - 100% polyester Imported Zipper garage and draft flap for comfort and additional protection from the elements MEGA heat fabric provides warmth without excess weight Secure zippered back pocket with bonded MP3 port Thumb loops Zipper garage and draft flap for comfort and additional protection from the elements