| http://www.w3.org/ns/prov#value | - Stretchable side members 18, 20, 24, 26 can be made of a single layer of a woven or nonwoven elastic or stretchable material, such as block copolymers of polystyrene, polyisoprene or polybutadiene, copolymers of ethylene, natural rubbers, urethanes, Kratons, and coextrusions/blends of the afore-mentioned.
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