The Metal heat is a all-new fabric which is layered into the entire front panel of the vest, and it keeps you warm by preventing cold air from coming in, while regulating your body temp during activity via state-of-the-art micro perforations that extract moisture while still providing breathability and keeping you comfortable. It also has a ton of other features like mesh side panels for breathability and stretch, speedzone technology that allows access to your jersey pockets, back gripper to keep things in place, and reflective elements for added visibility. Did we mention it’s also super packable and extremely lightweight? Pick one up today and never be caught out in the cold again!