I just wear my helmet cus' I'm not afraid of no stink'n rain. If my head gets cold, I have a thin wool cap I wear under the helmet to hold in the heat. But to tell you the truth, most times I'm so warm the last think I would want is to have my entire head covered. Your jacket's collar should be able to seal around your neck to stop most rain, but I just figure that I'm going to get wet either from the rain on the outside or from sweat from the inside.