Insert for vapor-permeable and waterproof soles

This is a special insert for shoe soles that makes them both breathable and waterproof. It's made from multiple layers of a plastic material that allows sweat to escape as vapor but blocks liquid water. One section of the insert is also designed to be thick enough to resist punctures, and the invention specifically focuses on using materials like e-PTFE, polyurethane, polyethylene, polypropylene, and polyester for these layers.

Why it matters: Manufacturing techniques for multi-layer polymer membranes have advanced significantly since 2010, potentially making the production of these specialized inserts more cost-effective or sustainable. Newer polymer formulations may also offer improved performance for these layered structures.

Status: Not in forceListed as no longer active. The specific reason is not in the record we hold.
How hard to build: SpecializedMulti-layer polymer sheet fabrication

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