I recently acquired on of these: [URL]http://www.sunax.de/english/index.html[/URL] and fitted it to my helmet. Seemed like a good idea, and it's okay when you're riding directly into low sun. The implication is that you can leave it fitted year-round. The reality is that, 99% of the time, it's irritating as fuck, distracting, obscures part of your field of vision and leads to the adoption of odd head angles trying to see past it. Of course, this may just be me being awkward and intolerant, so if anyone else wants to give the thing a go, you're welcome to it. It's the Arai version, with the cutouts for the rubber snouts.