| http://www.w3.org/ns/prov#value | - In general, the support layer has an areal weightof 20 to 200 g/m.sup.2, in particular 30 to 150 g/m.sup.2 and preferably 40 to 120 g/m.sup.2.The covering layer optionally envisaged according to the present invention is generally similarly constructed as a textile fabric, preferably an air pervious textile material, for example as a woven, knitted, laid or bonded fabric, in particulara nonwoven.
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