About: http://webisa.webdatacommons.org/376536121

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The inner layer 21 is substantially thicker than the outer layer 19 and is formed of a sheet of closed-cell, foamed polymer, such as polyethylene.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com