| http://www.w3.org/ns/prov#value | - The lower resistance layer may be formed from an elastic material, examples of which may include: rubbers, such as EPDM (ethylene-propylene-diene terpolymer), polybutadiene, natural rubber, polyisoprene, SBR (styrenebutadiene rubber), CR (chloroprene rubber), NBR (nitrile-butadiene rubber), silicone rubber, urethane rubber, and epichlorohydrin rubber; thermoplastic elastomers, such as RB (butadien
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