This is gas mask for police & military use, also industrial protection for workers.
 
The gas mask (GM-1) is a clean, simplified respirator thats up to 40% lighter than conventional full-face respirators and gives high performance, customized fit, comfort, economy, and user acceptance.

Dual-canister mount (bayonet ) allows weapon sighting from either side;
Fully elastic, 6-point head harness-easy on-off, adjustment, no hair pulling;

Standard nosecup helps eliminate lens fogging;
Effective against OC (pepper spray);

etc.