I finally figured out why the skin on my forehead was getting rough and why the hair around my face was suddenly getting shorter and wispier. Even though I periodically remove my helmet liner and wash it, I realized that it had arrived at gross. Just gross, nothing else.
I live in the land of nine month summers. My helmet gets sweat in more often and for a much longer duration than for what it was designed. The liner of my helmet had finally reached a point where I could no longer stomach putting it over my hair. It was crunchy, rough, and frankly, it smelled a bit off.
So, you're welcome. That's my PSA for the year. Replace your helmet as needed, but for the love of all that's holy (I am looking at you, Sweaney), replace the liner with a bit more frequency. Your forehead and hair will thank you.