<http://webisa.webdatacommons.org/prov/236391463> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/146489745> . <http://webisa.webdatacommons.org/146489745> <http://www.w3.org/ns/prov#value> "However, soles incorporating gels or gases such as air are costly to manufacture and relatively unpredictable in their functional characteristics." . <http://webisa.webdatacommons.org/prov/281379518> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/146489745> . <http://webisa.webdatacommons.org/146489745> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.co.uk> . <http://webisa.webdatacommons.org/146489745> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .