" An AR5 comprises a single piece rubber hood and heavy rubber cowling with neck seal. Incorporated in the rubber hood is an aircrew oxygen mask and transparent visor. Along for the ride is a handheld respirator - affectionately known as the 'Whistling Handbag' - which provides breathing air until the mask connects into an aircraft oxygen system. The mask has a number of inlets/outlets, among them; a connection for a microphone and a connection for a drinking tube. "
"
These masks were in service from 1979 up until the early 1990s. Where
chemical warfare was a threat, the AR5 was donned for safe passage
through the skies. "
Marmoset Toolbag Scene:

Unwrapped 25k Tris Low-Poly Version with AO and Normal Maps :

Base made in Zbrush, 3DsMax
Baked and Rendered in Marmoset Toolbag
Textured in Substance Painter
Real Life Photo Reference: