While a half helmet is safer than none at all, it doesn't offer the type of protection given by a full-face helmet. ... Half-helmets also only protect riders from serious brain injuries in 36.8% of motorcycle crashes. Besides, riders aren't protected from dust, smoke, or any other flying objects as they ride.
Are half face helmets safe?
This isn't to say, however, that open face helmets are absolutely unsafe. After all, 65.4% of all other crashes happen on other areas of the helmet, and most open face helmets come with face shields that drop all the way down to the area of the chin, which would be helpful for lighter impacts.
Why do motorcycle cops wear half helmets?
We wear half helmets (Seer) to aid in being able to see and hear around us. Remember, we keep the helmet on when off the bike and when dealing with a situation.