DrSport prescribes a tennis headband under your helmet in summer, to soak up all the sweat, hair gel, makeup and suncream before it gets into your eyes.
or just grow a monobrow, thats what its there for!
It's what a cap is for, especially if you've cropped hair.
Helmet? What helmet? What for?
Cut your hair short, get a helmet with really good venting and front brow pad.
I sweated so much this past weekend that it formed a rivulet along the toptube, ran down the seat stay and created a salty gunky deposit just on the gear hanger...