We have no restrictions about masking up for outdoor exercise where I live. But, I have been thinking about wearing a mask or face shield as the days get cooler. I doubt that masks or face shields provide any additional health protection against COVID-19 when biking outdoors and not in proximity with other people. This time of the year, I am always having problems with my glasses fogging up when I stop at a traffic light. I suspect that a face shield would fog even worse, but I wonder if the mask might actually help with that issue. I will have to give it a try!