Abstract: The present invention relates to methods for the preparation of high molecular weight polyhydroxybutyrate (PHB) by culturing Bacillus megaterium strains in a mixture of agri-food wastes, PHB obtained or obtainable by the methods as well as to its use in the preparation of articles such as, for example, soles and/or heels for shoes.

Abstract: Footwear is provided and comprises a bottom part comprising a sole and an integral rear upper section, and a separate top part comprising a front upper section. The parts are releasably connected to each other by a releasable fastener. Each part provides a fastener half and each fastener half has a start and an end. The rear upper section of the bottom part includes a heel cap portion. The top part comprises two ends at a rear part thereof and the ends are connected by a strap positioned between the start and end of the top half fastener, and a movable flap is provided and extends over the inside surface of at least part of the heel cap portion. The releasable fastener is a zipper fastener, in which each fastener half has a zipper track with a plurality of teeth, and the number of teeth on the halves is exactly the same.