Eye Protection is MANDATORY!
All goggles and safety glasses must have a hard lens and must meet ANSI Z87.1 standards. Due to the nature of the airsoft projectile, we strongly encourage there be a full seal around the eyes and have a safety strap to prevent them from falling off. Goggles with soft lenses or shop glasses without a full face seal can put your eyes in danger of contact with the BB, injuring you in a variety of ways up to and including blindness. If you can insert the eraser-end of a pencil between your face and your protection, it does not offer a "full seal"..
Goggles and glasses with anti-fog lenses are highly recommended. Clearing fog during combat operations must be done w/o removing your eye protection. If you remove your eye protection during an operation, you put yourself and others in danger and may be asked to leave.
Many types of eye protection are available from vendors like - http://www.safetyglassesusa.com. Chose carefully, do your homework and select the safest eye protection you can.