go into the stores and look at the little tag. and it's definately not a type - oakley has it in, what, 10 fucking languages? my japanese and russian friends both read it as 600mm. even my mom, who's chinese, can read the japanese one and said it was 600mm.
and to update their waterproofing tiers (cause i messed up on some of the names):
4 hydro fuel - 600mm
3 road fuel - 6000mm (this is 6000mm, so why would they have another tier in the system that has the same rating? makes no sense)
2 nitro fuel - 10000mm
1 rocket fuel - 20000mm (or 25000, i forget)
i curse your pubes with the fleas of a thousand camels