Mylar

BoPET is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, chemical stability, dimensional stability, transparency and electrical insulation. When metallized, it has gas and moisture barrier properties and is reflective. The film is "biaxially oriented", which means that the polymer chains are oriented parallel to the plane of the film, and therefore oriented over two axes.

A variety of companies manufacture boPET and other polyester films under different brand names.
In the UK and US, the best-known trade names are Mylar, Melinex, Lumirror and Hostaphan.
It was the first biaxially oriented polymer to be manufactured on a mass commercial scale.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.5