Typical polymeric materials for the present permeable film can include any material which can be sealed to the support member, such as polyolefin, especially propylene homopolymer or copolymer, or polyethylene, or any of a variety of ethylene copolymers including, for example, ethylene/vinyl acetate copolymer, ethylene/ acrylate copolymer, ethylene/acrylic acid copolymer including metal neutralize