From Sephora"s website:What it is:Smashbox makeup artists use this product to create a perfect canvas for foundation application. What it is formulated to do:The silky blend of vitamins and antioxidants smoothes and perfects skin, while the unique formula helps to inhibit the destruction of collagen, and fills in fine lines and pores for a flawless finish.What else you need to know:Use after moisturizer and before foundation for complexion perfection. This skin-soothing blend of antioxidants, which can be worn alone or under foundation, works overtime to fill in fine lines and even out skin texture.