Coating or impregnation specified as porous or permeable to a specific substance [e.g., water vapor, air, etc.]

Full Title

Fabric [woven, knitted, or nonwoven textile or cloth, etc.] > Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer > Coating or impregnation specified as porous or permeable to a specific substance [e.g., water vapor, air, etc.]