In cosmetics and personal care products, Dimethicone Copolyols are used in the formulation of hair sprays, wave sets, hair conditioners, shampoos, shaving products, and some makeup and skin care products. It makes a layer of silicone that protects the hair or skin. This ingredient is essential for products meant to go with heat treatment. Such as heat protecting serums or sprays. Dimethicone copolyols really make a difference when straitening hair.