What it is: A moisturizing foundation and light diffuser with SPF 25. What it does: Guerlain’s first moisturizing foundation and diffuser provides medium coverage and SPF 25 with a satin sheer finish. Enriched with Luminescent Water, a marine spring water that continuously hydrates the skin and infuses it with light, this foundation works over time with multireflective Prisma Light Pigments that diffuse light at 360° to leave skin radiant. What else you need to know: For normal, dry, combination, or sensitive skin.