Like others have said - a full face helmet. I have an HJC modular and wear it exclusively, winter and summer. Even convinced my co-rider a few years and she protested mightily but now loves her's also. I know, I know many will say they are way too hot but that has not been my experience. When it's hot it's hot no matter what helmet you have. Before when I wore a half and then a three quarter helmet I'd get sunburn, windburn and my face would feel like leather in the summer heat. With the modular with an internal sun shield I never use sunblock except maybe on the back of my neck occasionally and never had any problems. Personally I would not ride without my modular helmet. It's all in what you get used to imo.