I just make sure there is alot of foam, and fits in my helmet nicely, and fits on my face nicely. I use steelmx and really like them. Their chrome lenses scratch pretty easily but clear is good.
http://steelmx.com/moto/index.html check them out.
"Jump for show, Corner for dough"
"In ball and stick sports they give you the balls, In Motocross you have to bring your own"
Sponsors:
Spencer Motorsports, 661, Renthal, Dunlop, Sunline, Tag, FC Mods, DRD, Acerbis, MotoGraphX, Steel Mx, Weapon Mx, Glens Sport Center, Filtron Filters, State Farm, Sibley Sheet Metal,