The main advantages of fumed silica in providing soft texture in cosmetics are as follows:

Fine Particle Size: Fumed silica typically has a very fine particle size, usually on the nanoscale or submicron scale. This fine particle size allows fumed silica to be uniformly dispersed in cosmetics without graininess in the product. It forms a smooth, supple film on the skin, providing a supple texture.

Soft refraction characteristics: Fumed silica has soft refraction characteristics, that is, when light hits its surface, the light will be reflected and refracted multiple times inside it, forming a blurred optical effect. This soft refraction effect blurs and softens the appearance of fine lines and pores on the skin's surface, providing a soft texture.

Filling depressions: As a filler, fumed silica can fill tiny depressions on the skin surface in cosmetics, such as fine lines and pores. It fills in these depressions, smoothing the skin's surface for a softer feel.

Lightweight texture: Although fumed silica can provide a soft texture, it has an inherently lightweight property. It is less dense and does not leave a heavy or sticky feel on the skin. It spreads lightly on the skin and absorbs quickly, making makeup feel light and comfortable to apply.

To sum up, as an ingredient in cosmetics, fumed silica can provide a soft texture, mainly due to its fine particle size, soft refractive properties, filling depressions and light texture. These properties allow fumed silica to leave skin looking softer, smoother and more comfortable to use. It should be noted that the specific effect may also be affected by factors such as product formula, method of use, and individual skin quality. Therefore, when choosing and using cosmetic products, it is recommended to refer to product instructions, consult a professional, and follow appropriate usage instructions and recommendations.