I've got a windshield on one of mine, not for the cold, but because it's always raining down here. Hell, it's raining right now. I found that if I mount the shield high enough to cover my face, it slows the 'ped down, but if I mount it low, hugging the headlight bucket, it actually gives me 1 or 2 more mph. If it starts raining, I can crouch down. Doesn't do squat, though, when I have to stop at a light.