The Mach 7 has been one of our most popular warm-weather jackets for a while now. It features Fieldsheer's wide-loop polytitanium mesh shell, so it flows as much air as anything on the market. Of course, if the breeze is a little too much for you, you can always zip in the removable liner to block the wind, and even keep you from getting soaked if a storm sneaks up on you. CE armor, reinforced ballistic material in critical areas, and reflective Phoslite score big points for safety, and adjustability on the waist and arms keep you nice and comfy too. - MF