The air proofing of the mask on the face of the wearer is allowed by a foam rubbrer beading running around the edge of the facepiece; it’ s, also, covered with soft immitation leather

A metalic frontpiece casing is stamped on the facepiece and includes the outlet valve and the filter fitting.

The seven points head harness is made of spring straps

A parallelipipedic hard cardboard box with shoulder strap is suoolied for the carrying.