Rock The Fan!
I use these when its dumping outside or my heart rate is up and I need a goggle on. The noise when in the "ON' position isn't noticeable unless it is silent. But when in the "HIGH" position to clear up any fogging the noise is more noticeable, but not too bad. When wearing the goggles, always have them in the "ON" position , then when you experience fogging, move to the "HIGH" position and the fog will dissipate. over all I am a huge fan, but I have had to remember that in given situations (when overhead blower drowns you, you get lost in the white room, your hear rate is through the roof) any and every goggle will fog a bit.