Repeated attempts have been made to replace leather, with its special property, exclusively by synthetic substitute material. With some exceptions such as the technical or some garment leather, bag leathers, bag leathers and the leather for shoe underside construction, the laregest consumer market, i.e for shoe upper leather, has not been succeeded in finding an adequate substitue despite all efforts.
in jenral, the following factors determine the outstanding properties of the '' natural product leather'' compared to synthetic substitute materials.
- the enormous
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