I'm training for my first century and despite slathering myself with sunblock I'm having problems with sunburns on my legs. I've been wearing PI Ultrasensor shorts but I think I need something that provides better coverage. The problem is, I live in Southern California where triple-digit heat is not uncommon. Is it possible to find knickers or tights that are relatively comfortable in the heat and have chamois (chamoises? what is the plural?) that can handle long-distance rides? Would leg warmers do the trick or would they be too hot?

Thanks for any advice!