1. ↑ Cyclopentasiloxane. Silicone; makes stuff easily spreadable; used as a conditioner, delivery agent, lubricant & solvent. Helps deliver other, heavier, silicones also in a product (like dimethicone)
2. ↑ Dimethiconol. Dimethiconol is used in skincare and cosmetics as a/an anti-foaming, emollient moisturizing, MOISTURISING ingredient.
4. ↑ silicone ( Phenyl Trimethicone ) gives skin a nice “slip”, film-formers; can “carry” other active ingredients; may clog pores for some (depending on the silicones properties); some are water-soluble, some not; anti-foaming; skin protectant