1) More sunburn every year through the vents in my helmet, since the hairs on my head are numbered, as are their days.
2) After about an hour of riding, sweat wicks across my helmet's forehead pad and drips into my eyes (the left more than the right, which makes my mirror useless when I need to close the eye).
Skull cap, sort of a cycling cap without the visor? Other suggestions? Sources thereof?