| http://www.w3.org/ns/prov#value | - One material which has been found to be particularly useful in manufacturing the inflated insole of the present invention is cast or extruded ether base polyurethane film having a shore A durometer hardness in the range of 80 to 95 (e.g., J. P. Stevens' film MP1880AE or MP1890AE natural un-pigmented in color).
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