The Quantum WaveCel is a 5-star rated mountain bike helmet with updated WaveCel safety technology that's lighter and cooler than ever. This do-anything helmet features a well-ventilated design with recessed channeling to provide more airflow on your warmest rides. Plus, finding the perfect fit is easy with the Headmaster III Fit System and a three-position adjustable visor. Storage channels make it easy to store your sunnies mid-ride.