AW® is a new type of window film invented in 2014 that is patented worldwide. It was created to provide an alternative to polystyrene window films for envelopes that can compete on both quality and price. AW® is made of two layers of copolymer/polypropylene. It has advantages over polystyrene like higher density for better yield and compatibility with high-speed sorting equipment. AW® has been tested and approved for use in envelope converting, printing, sorting, and inserting machines by major postal companies and adhesive manufacturers. It is available in various thicknesses and finishes and has gained popularity as one of the leading window film brands in Europe and some South American countries.