Well, imagine watering a plant in tightly packed soil: the water just sits on top, stagnates, and the plant's roots don't receive the benefit of moisture.
Our skin is in layers - and for our skincare to penetrate deeply, it needs to be prepped by using an essence. Somewhere between a toner and a serum,Β an essence basically transforms your skin into 'loosened soil', so that it can fully absorbΒ the remainder of your skincare routine.