The military protective mask OM-90 Thread: Rd 40 × 1/7″ (standard in NATO) Filter: can be either on the left or on the right side of the mask Use: particularly in the event of the deployment of weapons of mass destruction or during various industrial accidents Sizes: 3 Manufacturer: Gumárny Zubří, The Czech Republic The design of the OM-90 protective mask is based upon military requirements. With a suitable filter, it provides protection of the respiratory system and face in the event of the deployment of weapons of mass destruction, i.e. nuclear, chemical, biological, toxin and radiological weapons, as well as during industrial accidents etc. The main advantage over the CM-6M civilian mask is the tempered silicate glass and a design of visors that allows you to work with various optical equipment such as night vision goggles or binoculars. Integrated Straw for Hydrating while Donned. 1 Filter included