Nothing breathes as well as a visor, and the super light, absorbent RACE VISOR even has holes in the brim to keep weight to a minimum and breathing to a max. It's essential equipment for racing in very hot conditions.
Endurance racers don't skimp on weight savings, and this fabric is incredibly lightweight.
Breathable panels help airflow while running.
The best protection with the least weight makes a more useful piece. They don't get much lighter than this.