Bobbi Brown Skin Foundation SPF 15 What is it: This water-based, oil-free formula delivers undetectable coverage and a fresh, hydrated glow for the most natural skin-like finish. Buildable formula goes easily from light to medium and is available in wide range of shades for all skin tones. Who is it for: Normal to oily skin types. Anyone who wants a water-based, oil-free foundation with a natural finish. Why it's different: The lightweight, water-based formula sinks into skin, instantly helpi.