Medium-chain length polyhydroxyalkanoates (mcl-PHAs) are very special biopolymers and not at all brittle like the common polyhydroxybutyrate (PHB), but elastic and flexible. Due to their chain structure and molecular arrangement mcl-PHA is able to withstand bending and stretching, while featuring tensile strength and durability. mcl-PHA is a natural polymer, fully biodegradable and compostable. Thus, it offers a sustainable alternative in areas where elasticity is crucial. It could replace non-biodegradable elastane aka spandex/lycra in clothing, it could replace latex or nitrile disposable gloves, it could be used for tires to avoid microplastic tire abrasion and in could be used in many other applications from elastic adhesives, coatings, sealants, bandages, filaments for 3D-printing, etc.