TB-FMA Helmet Goggles, Airsoft Tactical Ballistic Anti-Fog Goggles Military Safety Glasses for Helmets with Side Rails (2 Lenses Clear & Dark Included) Designed for -- helmets with side rails, also compatible for other weapon sight with side rails. PC Lenses -- Lenses are made from polycarbonate, can protect your eyes from BB, smoke, small particles etc. Pliable & Adjustable -- The frame is made from polyethylene material which is pliable and makes you comfortable; Non-slip adjustable strap for different head circumferences. Anti-fog -- The lenses are anti-fogging, perfect for outside activities in fog. Super Value -- Comes with 2 lenses (clear & dark) for your different needs/option. Come with the cloth which is great for wiping the lenses down.