The question is bound to come up again and because the last thread that had anything to do with this topic was closed, I figured I'd retouch on the subject. It is not recommended that the heads be obstructed by anything. Not glass (tinted or clear), not plastic (tinted or clear), not mesh, not anything. But will it still work? It has worked for a member of this forum who rides his motorcycle regularly and on trips that can amount to hundreds of miles at a time. Please visit the link below for further explanation. Some Mods seem to want the "tested" truth hidden or forgotten. Let's hope that this is never the case.