| http://www.w3.org/ns/prov#value | - The important feature is that the material from which the hood 10 is produced does not permit the ingress of liquid water into the interior of the hood yet has sufficiently permeability to gasses including oxygen and carbon dioxide so that the oxygen is replaced within the hood as it is depleted by breathing and the exhaled carbon dioxide migrates out through the material or fabric of the hood.
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