What it is: A waterproof foundation that lasts for 36 hours with medium-to-full buildable coverage and a satin finish.What it does: This tenacious M·A·C waterproof foundation formula can be used as a foundation or concealer, wearing for an unprecedented 36 hours. Neither rain nor tears can budge this oil-free waterproof, sweat- and humidity-resistant foundation. M·A·C Pro Longwear Nourishing Waterproof Foundation blends seamlessly on the skin with medium-to-full weightless coverage and a natural satin finish. Let your look outlast your face mask! This formula is mask-friendly, transfer-resistant and it won't cause acne.Shade guide:- C: Cool (golden, olive undertones)- N: Neutral (beige undertones)- NW: Neutral Warm (pink beige undertones)- NC: Neutral Cool (golden beige undertones)How to use: Apply to skin using a sponge or foundation brush, then blend with fingers, sponge or brush. 0.84 oz. Oil-free Dermatologist tested; ophthalmologist tested Nonacnegenic