Silicone oil can significantly enhance the skin feel of cosmetics, making the skin feel soft and smooth, and forming a smooth protective film. 

It has excellent stability and water resistance, and does not react with other components. It can enhance the waterproof performance of the product (such as waterproof mascara), while maintaining a certain level of breathability and not completely blocking the pores. 

In addition, silicone oil can also enhance the application and extensibility of products, making makeup products such as foundation apply more evenly.