TB-FMA Tactical Anti-Fog SI-Ballistic Regulator Goggles with Fan Airsoft Glasses for Ski Bike Sports This airsoft goggles is an enhanced version with a mini-fan device which can make you in a comfortable state. Powered by 1 x AA battery (not included). A piece of free transparent anti-fog lens for replacement. The lenses are made from thick polycarbonate which can protect your eyes from smoke, fog, sand or flying debris. Half of the goggles strap is elastic and can be adjusted to the size you need. Buckles on the sides are also for adjustment. The goggles frame is made from polyethylene, which could enhance pliability and confortability. It is great for outdoor activities, airsoft game, paintball, etc.