Review on Stay Warm with Hot Leathers Neoprene Face Mask - Ultimate Protection for Winter Sports and Outdoor Activities by Tim Jenkins

Without a doubt this is a great face mask! Worn alone, as was probably intended by the manufacturer, then it is simply terrific. However, when you add glasses and need to do strenuous activities, the fogging problems appear immediately. As already mentioned, the nostrils are too narrow and the mouth is not sufficiently ventilated. I enlarged the nostril and that alleviated the problem somewhat, but to fully solve it you'll probably need to punch another 10 holes around the mouth.