Rainpal looks like a well-thought-out invention. It fits to just about any helmet, it gives you multi-speed visor wiping, wiper delay and visor cleaning spray, and it's tested up to 100 mph (160 km/h). It charges via USB and snaps off in seconds when the sun comes out. By any objective measure, itâ€... Read more
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Rainpal sell these already
Wipey are requesting funds to make one of these. They need a light-weight version for mountain bike goggles.
An easier solution may be to just cover the visor in liquiglide?
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