From Fox:

THE LIGHTEST AND MOST BREATHABLE FULL-FACE HELMET WE HAVE EVER CREATED

The Fox Proframe Helmet is the original full-face trail helmet and still the market leader. Designed to meet the needs of all-mountain riders and enduro racers, it packs MIPS™ technology and a dual-density EPS liner into a superlight shell along with our patented, fully integrated chinbar.

The Proframe Helmet has 15 intake and nine exhaust vents which provide exceptional airflow and breathability on both climbs and descents. Thanks to its fixed design, there's no need to stop, remove, and store the chinbar. Ride wide open with the Proframe.