Originally Posted by Mtracer

I can't address your question as I have no experience with koroyd, but I do have a helmet with wavecel. As for sweat, consider using a skull cap rather than bandana. Likely your bandana is made of cotton and cotton doesn't wick moisture that well. And also the bandana will have many folds in it and may be more insulating. Skull caps are typically made of synthetics and are very thin. The moisture wicks away and dries very fast. While more airflow is a good thing either way, you might find a skull cap works better than a bandana.

My issue with Wavecel is you can't slip sunglasses into the helmet.