| http://www.w3.org/ns/prov#value | - The foam layer may have a thickness of about 9 mm or less, such as about 3 mm or less or about 2 mm or less, and may have a basis weight of about, 150 g/m2 or less, about 100 g/m2 or less, about 50 g/m2 or less, and about 40 g/m2 or less, such as from about 10 g/m2 to about 80 g/m2, or from about 15 g/m2 to about 55 g/m2.
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