I have a solution - ban meshWell if it hits your lower mesh it's going to go through it... same with mesh eye pro.
Unlikely to be at a velocity that is dangerous however impurities or dirt in the projectile could be carried through. I know they use mesh in AUS but there is a huge difference between being hit by a projectile you expect and one that you've not prepared for. Like Nerf I suspect that these would be compatible with airsoft sites but not necessarily players without explicit consent.
... and while we're at it add full face ...
Or more realistically, mesh meets airsoft eye protection requirements (not safe as far as I'm concerned, but they meet the standards and its up to sites & their insurers)
The gel / water mix burst from a gel ball is not going to be good for an eye behind mesh.
I've taken paint from numerous paintballs into my mouth, and have also had indirect paint in my eye through netting - burst from an indirect hit with some distance from the netting was not comfortable.
A direct mesh hit into the eye risks damage.
Airsoft, paintball and gellsoft are similar but they are sufficiently different.
For gelsoft I would need to know the impact of a gelball or feel a hit to consider whether full face is necessary (I'd generally always recommend full face!)
It makes sense that if mediums were mixed then the highest protection standard would be required