A primer for skin that stays luminous and soft for 8 hours | The illuminating primer MAC Cosmetics Studio Radiance Moisturizing + Illuminating Silky Primer perfectly primes the skin for an even application of the foundation. Thanks to its hybrid gel-water texture with Moisture-Reserve technology, it instantly and beautifully hydrates the skin. It leaves it fresh and keeps it hydrated and luminous for up to 8 hours.