One of the worst problems with riding a motorcycle, must be when your visor mists up.  This little gizmo cures that.

The Fogcity is a plastic insert that attaches to the inside of your visor.  Fitting can be a little bit tricky, and you must make sure that you get the correct one to fit your visor, but once in place almost completely stops visor misting.

The only problem can be "Staring" at night from other vehicles headlights, but this is only a minor issue.  If fitted correctly, you don't even know that it's fitted. There is a very slight blurring, car lights have slightly more sparkle, but not enough to interfere with your vision.

Good Points
  Extremely robust - no wearing parts.

Bad Points
  Do they make them for spectacles?

How much?
  £12 - £17 depending on make of helmet

Available from
  Most motorcycle dealers.