Great for olive skin tones!
This is an excellent silicone-based primer that neutralises red or pink tones. As someone with olive-skin tone, most foundation aren't quite the right shade for me - they are either too pink or too orange. Using this green primer not only makes foundation go on smoothly, but also adjusts foundations that are a bit too pink/too orange so that they match my green skin tone much better. Having this makes me waste less foundation!