Window film is a multi-layer polyester construction: a scratch-resistant hard coat on the outside, the functional layer in the middle, and a pressure-sensitive adhesive against the glass. What separates a AED 800 tint from a AED 2,500 one is entirely that middle layer.
Dyed film’s middle layer is just dye — it looks dark but blocks little heat and fades purple in UV. Metallic film uses metal particles for real heat rejection but interferes with electronic signals. Nano-ceramic film embeds ceramic nanoparticles that block infrared heat and UV at a molecular level: maximum heat rejection, zero signal interference, no fading.
VLT (visible light transmission) measures darkness: 5% is limo-dark, 70% is nearly clear. Darkness and heat rejection are independent specs — a quality 50% ceramic film rejects more heat than a cheap 5% dyed film. Always compare IR rejection percentages, not shades.