For an additional £10 comes with front or side com optional.

The S10 NBC Respirator is a military gas mask used within all branches of the British armed forces, and is currently in working service.The S10 was introduced in 1986 as a replacement for the S6 NBC Respirator in service from the 1960s, and is manufactured by Avon Rubber.Two filter canisters are issued for the S10, as with the S6; a light pressed metal type for riot control situations or training (marked with a painted red stripe or red tape), and a heavier plastic encased type for protection against NBC agents. The latter have a maximum shelf-life of 10 years, and the mask itself (the facepiece) of 20 years. The mask has many features including a fail-safe drinking device, a Secondary Speech Transmitter (SST) on the side which can accept special microphones, and corrective lenses can be fitted to the eyepieces. The mask also contains an inner mask to decrease fogging on the len.