After a couple of hours riding, my wife starts suffering from uncomfortably itchy head/hair. We have tried a couple kinds of helmets (all full-face, but with different padding kinds) and different kinds of head wraps - the stretchy kind, a silk scarf, etc. Have not yet tried one of those sweat-wicking skull caps sold for other sports, but the problem does not seem to be sweaty / heat related; still happens riding in 50-degree F. weather. Any suggestions?