Patent No. EP3334302 (titled "Booties And Footwear Assemblies Comprising Seamless Extensible Film, And Methods Therefor") was filed by W L Gore & Associates on Aug 12, 2016. The application was issued on Jul 8, 2020.
A waterproof, breathable shoe insert that conforms to the shape of a shoe, comprising a seamless, extensible film and a textile positioned on one side of the film. The film is stretched over a symmetrical last to form a bootie, which is then placed on an asymmetrical last and heated to conform to the shoe shape. The insert can be formed without a textile, using a single-step process to stretch the film over the asymmetrical last. The insert can also be used as a standalone product, with a polymeric overlay for added cushioning and support.

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