[Merv and Sharon]

All interesting questions and hard to answer as no one, here at least, has used them for an extended period, or indeed in racing. I could be wrong about that.

If they are made and fitted well there should be no flapping. The outer edges could contain a nylon rope or even elastic cord to ensure tightness. I am not sure about the aerodynamics but either the leading or trailing edge could have the most air pressure.

Finally, the alternative for the Harrison now is nothing or the Stoneguard film. I have used the latter in the meantime until I get some good spats made up. It fits quite well.

The really interesting question as Warren suggests, is which material is most durable. Soft leather is said to be the most flexible and potentially best fitting, but may not therefore be more durable than a commercial multilayer vinyl.

Merv