| 摘要 |
<p>The present invention provides a superior double insulated rubber vulcanizate footwear product for use in sub-artic climates. In general, the footwear product of this invention comrises a removable insulative liner insert sized so as to accommodate a foot of a wearer and an insulated rubber vulcanizate provided with an internal foot cavity of a size sufficient to accommodate a foot of a wearer and the removable liner insert. The insulated rubber vulcanizate construction includes an inner rubber vulcanizate portion generally defining the internal cavity of the rubber vulcanizate and contoured so as to permit for the insertion therein or removal therefrom of the removable insulative liner insert, an external vulcanizate shell circumscribing said inner vulcanizate portion and intervulcanized with said inner vulcanizate portion so as to form an internally disposed chamber within said rubber vulcanizate, gas molecules confined within said internally disposed chamber and an open-celled insulative layer sandwiched between said inner vulcanizate portion and said external vulcanizate shell with said open-celled insulative layer circumscribing and generally defining the contour of said inner vulcanizate portion.</p> |
