The ShMS (Russian: Шлем-Маска Специальная - "Special helmet mask"), designated the SchMS (German: Schutzmaske Spezial - "Special protective mask") in East German service, was a Soviet optical gas mask issued to snipers and artillery crew during the Cold war.
Like other Soviet gas masks made during the Cold War, the ShMS was made in both grey and black variants. The ShMS has a voice emitter at the lower front area of the mask, which is covered by a protective metal cover with multiple holes. The voice diaphragm is fairly standard for the time, using a thin piece of plastic below the metal protector piece to amplify speech. The diaphragm's cover is identical to the one used on the MM-1. The mask lacks an oral-nasal cup, much like other Soviet masks during the Cold War but has a Tissot tube system and the eyepieces can fit antifog inserts. The lenses of the ShMS are positioned so that soldiers can look through various optical devices while wearing the mask. This gas mask is almost identical to the PRVU.
This mask is currently in use by the Syrian armed forces as the standard gas-mask for their NBC squads.
The ShMS uses the standard Russian 40mm GOST thread design to attach a filter or hose, and was issued with a standard EO-16 "coffee can" filter.
It was issued as a part of the RSh-4 kit along with other masks in the Soviet Union.
In East Germany first it was issued with a simple "Blumentarnmuster" bag (similar to the Soviet Type A bag) alongside with SchM-41-M and MM-1. Then a simpler bag without camoflage and a waterproof ruberized bag was issued, to scouts a "Strichtarn" bag was issued.