Transparent face mask?

OK, this one just baffles me. Over at the Modern Mechanix blog, there is an old advertisement for a transparent face mask from the March 1940 issue of Popular Science magazine. Looking at the ad, all I can see is a plastic bag which someone put on a chicks head. Haven’t we spent our entire lives being told not to put plastic bags on our heads due to danger of suffocation? And isn’t putting a plastic bag over a woman’s head something more likely to be done by a serial murderer? And why is this woman smiling?

Transparent Face Mask
Slipped over the head, a bag of cellulose tissue designed for use in skiing and other outdoor sports offers protection for the face without interfering with vision. The transparent mask can also be used as a shower cap, an apron, a tray cover, and a turban, the makers say.

[tags]Modern Mechanix, Transparent face mask?[/tags]