| http://www.w3.org/ns/prov#value | - According to this invention a shoe insert slab is molded from a relatively rigid non-slipping type of plastics material such as polyurethane, nylon, thermoplastic rubber, and other suitable elastomers preferably having a Shore hardness of from 30 to 80 with a Shore hardness range of 45 to 65 being desirable.
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