Originally Posted by
brian3069
What can be worn under the helmet to protect my balding head from the sun.
I always ride with an old-fashioned cycling cap under my helmet, usually with the bill in the back. I use ones from Rivendell because they seem to stock caps that are a little bigger than most and fit my 7-5/8 noggin better, but any one that fits is fine.
If it's cold outside, I wear the cap and an ear-covering band. Where I live, that pretty well gets the job done from a warmth perspective. The next step up is to add a helmet condom or just use a wool cap, although the wool cap can be a bit bulky. Purpose-made ear-covering skull caps are available, but I have never used one because I haven't needed one often enough to make it worth my while.
If it's hot outside, the cap absorbs sweat and keeps it out of my eyes. If you need more cooling than that, a wet cap at 15+ mph can do wonders.