Plus one for this, although I have a Castelli summer skull cap.A white Headsweat skull cap Amazon.com: Headsweats Shorty Beanie, White: Sports & Outdoors
I made my own screen. It's a UV rated screen for screen doors.I agree with the beane thing, it's the only thing that will work, and putting sunscreen on your head will make the helmet interior disintegrate faster then normal. There was a helmet that came with a internal screen that was suppose to prevent head burns and bugs, but I'm not sure if it's made anymore.
I'm not a skull cap/bandana/headsweat user but for those who do, even in hot weather you can stay cool by occasionally shooting some water in the vents of your helmet. As the sweat evaporates the salt content of what is left behind rises and so the evaporation rate declines (colligative properties). Fresh water will dilute the salt and restore the evaporative cooling that is the key.A white Headsweat skull cap
This is absolutely correct. I use to live in the Mojave Desert area of California and tried using sunscreen while cycling and I felt like my skin was on fire, I was much hotter feeling using sunscreen then without, so I rode without. BUT, note the big BUT, if you are a very fair skin person riding without sunscreen could eventually lead to skin cancer. I lived in the Mojave Desert area for 15 or 16 years and rode everyday without sunscreen, but I have an olive complexion and I didn't burn easily, I have no problems with skin cancer. But again if your fair skin you may have to put up with feeling hot, but wear a skull cap on the head because sweat running down mixed with salt and sunscreen is very unpleasant when it gets into the eyes.Sun screen is messy and it keeps you from sweating so you get hotter.
Then you're not riding fast enough. Speed up to enjoy the cooling breezes.I have a white sun cap, but it gets pretty hot