Designed to meet military and civil defense requirements. 3 NATO 40mm DIN 3283 filter ports. Side location of filter allows more comfortable aiming of gun. Features Ballistic and chemical aggressive treated face shield. Silicone face seal (excellent for long period use; tested for 6 days without removing). Compact large field of vision. Easy maintenance. Full-face mask is fitted by headpiece with 6 straps, which can be adjusted to ensure perfect fit over face. Internal nose and mouthpiece allow air inhaled to pass through the visor without causing condensation or misting and reduces un-used space inside mask to prevent build-up of carbon dioxide from the air exhaled. Although these products are brand new and have been rigorously tested, they are sold as a 3rd party company and we are not liable for any misuse or malfunction.