When you experience that silky smoothness as the product touches your skin, there is likely a "dimethylsilicone oil" chemist at work behind the scenes. This colorless and odorless liquid polymer is using its unique method to transform our skincare and makeup experience. 
The core secret of dimethylsilicone oil lies in its molecular structure. It is composed of a main chain formed by repeated silicon-oxygen bonds, and the methyl groups extend outward like an umbrella, forming a smooth and low surface energy hydrophobic layer. When it spreads on the surface of the skin or fur, it is like covering the microscopic rough peaks with a smooth layer of ice. It can instantly fill the fine grooves between the keratin scales and the uplift of the hair scales, transforming the originally light-reflected rough surface into a smooth-reflected mirror surface, thereby creating a delicate and flat soft-focus effect both visually and tactilely. 
In the formula, it plays multiple roles: in the skin care lotion, it provides immediate smoothness and promotes spreading; in the sunscreen product, it enhances the waterproof and sweat-resistance properties; in the hair conditioner, it makes the hair cuticles smooth, significantly reducing damage from combing. What's more ingenious is that it can form a light and breathable film on the skin surface, locking in moisture while hardly being absorbed by the skin, thus avoiding the problem of excessive oiliness. 
It is precisely this ability to "smooth out the roughness" in the microscopic world that makes dimethylsilicone oil an indispensable supporting role in creating a silky skin feel and smooth hair. It is like an invisible velvet glove, using technological power to gently optimize our every touch experience.