Polyester

Polyester is a category of polymers that contain one or two ester linkages in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include some naturally occurring chemicals, such as those found in plants and insects.

Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not.
Synthetic polyesters are used extensively in clothing.

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Source: Wikipedia · Image: Wikimedia Commons · CC0

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