Why don't you contact Stirling and ask them?
There only appear to be two rules on their website regarding Eye protection:
- Eye protection must be worn at all times, except in the designated safe zone!
- Sleeping in game is done so at your own risk, players MUST keep eye protection on at all times. Personnal kit is to be kept to a minimum in game area’s. Keep it in your car until you need it !!!Only on 24 hr games.
As stated by others protection will be typically limited to paintball-approved goggles at any paintball field to meet insurance requirements. Otherwise it is up to the host to lay out requirements based on what they perceive is the minimum safe requirement.
* puts spoon away *
They are your eyes, protect them accordingly or don't feel badly when they get damaged due to negligent behavior.