I've been wearing a helmet this season due to a concussion I got skiing in March. It was a minor concussion that lingered for 2.5 months- very annoying.

On the F18 I've been wearing a kiteboarding helmet Tripp let me borrow. On the Moth I've worn a Bern helmet that MIT provides at the sailing pavilion. I haven't really noticed having either of them on.

Unfortunately I tore a ligament in my hand during the statue race, so the helmet hasn't been needed for a while!