The met strale utilizes the venturi effect via an air channeling system that pulls in cool air and pushes heat out feather light wearing the strale is unobtrusive as any top range all around helmet should be the met strales exceptional air channeling system design features a large central vent that takes in cool air along with side channels maximizing overall ventilation thanks to the venturi effect hot air exits through the back exhausting vents pushing it away from the rider all