Thin protective display film

An article comprising:

• an optical display;
• a transparent protective film disposed on the optical display, the protective film comprising:
• a transparent polymeric substrate layer;
• a transparent aliphatic cross-linked polyurethane layer disposed on the transparent polymeric substrate layer and having a glass transition temperature in a range from 11 to 27 degrees Celsius, a cross-link density in a range from 0.34 to 0.65 mol/kg, and a thickness in a range of 20 μm to 100 μm, and comprising aliphatic cross-linked polyurethane prepared by step-growth polymerization of polyol with an isocyanate-functional material;
• and
• a hardcoat layer disposed on the transparent polymeric substrate layer or the transparent aliphatic cross-linked polyurethane layer;
• and
• an optical adhesive layer fixing the protective film to the optical display,
• wherein the optical display and the protective film are foldable so that the optical display faces itself and at least a portion of the protective film overlaps another portion of the protective film, and
• wherein the protective film is transparent from wavelength 380 nm to 700 nm.