I wanted a pair for ages, only I dont buy expensive stuff with out picking it up first and trying it on, I could'nt find any thing local to australia, so I decided to buy some snow board style chemical goggles, and a replacement mes visor, oh and a tube of rubber glue and a black marker to cover up the glue,(my mate thought I had brought them It was such a good job). there is heaps on this online for bb gun stuff, you take out the plastic lense and use it to mark the shape, of the lense you want to cut from the mesh, then you just glue it in place.
well they worked (copped the end of my pole belt clip at full force.. just a dent) well but, the goggles I got were rubber, so the mesh got easily bent in my bag, if I made them again I would gett the goggles with the individual lenses, because they have a better structure, and they dont cover as much of your face so they dont get sandwiched between your helmet peak and the tip of your nose, the padding was wet suit which got to slimey when I sweated. and i would use fine mesh instead.
They were not CE but neither are some of the goggle listed here, and they worked, I was saved more than onece because of them, never came home with a scratch across my eyelids, as has happened to me with glass's and visors. they also had blind spots which took a bit of getting used to when you were in a tight spot, clear sides would help.
to be honest, i have given up on them as they had as many problems as goggles or visors. may make or buy a more expencive set up later, as I brought the cheapest stuff I could get away with.