MET RIVALE HES £110
Despite the Rivale’s rather closed design, the venting and airflow is impressive. Large internal channels keep it feeling airy, and with MET’s design work focusing on creating a venturi effect that draws warm air from around your head out of the back of the helmet. With the large port on the crown, you can create more cooling by dipping your head towards the air. Aero claims are one thing but this is a premium lightweight (257g, size L) lid that’s very comfortable and well constructed, at a price half that of its competition.