The foil is as thin as possible and a great advantage over the competition is that the edges are completely covered. It regenerates even after years and does not affect the colors or the screen in any way, to be honest you don't even notice that there is a film. A little advice for those who want to try, I would recommend a different approach to mounting the film compared to a mobile phone: the Apple Watch has quite rounded edges and if a lot of gel is applied, it is a bit difficult for them to stay, you can struggle a bit. Therefore, it can help to use less gel with more care so that the bonding is faster, possibly immediate.