Occasionally, I wear Deth Killer jeans - Made in USA with the Kevlar woven into the denim. Hot, heavy, bomb-proof & bad ass. Sadly, the company is no more. But there so many more choices today from Dainese, Revit, and Ugly Bros - just to name a few. I personally only wear jeans on casual rides around town or to social get-togethers. In the canyons or touring, I'm in full leathers or technical textile gear.
While we don't get the humidity like Florida & other states, California can get pretty hot in the summer. But I'd rather sweat like a pig than skinned like one...