I do that too but I still sometimes get burned or at the least very tanned on my left arm from driving home from work, in the summer. I've thought about even tinting my windows but my car already has a pretty dark tint. I guess the sun is just that much more intense. I've never gotten sunburned but it's never been record highs all the time
in the summer. Or I've become more sensitive to sun somehow. Or a combination. IDK if there's anything I can do about it. I use very high SPF. I HATE sun spots and getting sunburned.
Not looking forward to summer.