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A landfill liner, or composite liner, is intended to be a low permeable barrier, which is laid down under engineered landfill sites. Until it deteriorates, the liner retards migration of leachate , and its toxic constituents, into underlying aquifers or nearby rivers from causing potentially irreversible contamination of the local waterway and ...
Figure 1 from Emma Read's patent for a "Portable Baby Cage" A baby cage was a bed in a wire cage suspended from city apartment windows. The "health cage", as it was initially called, was invented by Mrs. Robert C Lafferty to provide babies with fresh air and sunshine while living in crowded cities.
Air permeability is the ability of a fabric to allow air to pass through it. While air permeable fabrics tend to have relatively high moisture vapor transmission, it is not necessary to be air permeable to be breathable.