If you're one of those ladies who go out a lot but rely mainly on BB creams (or other cosmetics with SPF) as your sole protection against the sun, then think again. I admittedly use my multi-functional BB cream during those days when I only needed to go out for a few minutes, and skip the sunscreen due to the usually greasy effect they give on my face. However, BB creams alone wouldn't be enough for longer sun exposure - even those with a high SPF and broad spectrum protection - because BB creams are only supposed to be applied sparingly on the face. Unless you're willing to slather your face with a full-shot-glass amount of BB cream, a tiny amount of BB cream will never be enough to keep you protected, and so comes in the heavy-duty sunscreen.