Overnight Resurfacing Mask with AHA & BHA Sample 0.25 fl Oz. 0.25 fl oz/7 ml This overnight mask, powered by a complex of 6% Alpha Hydroxy Acid (AHA),0.4% Beta Hydroxy Acid (BHA) and Fruit Acid, helps exfoliate skin, unclog pores, and visibly improve the appearance of fine lines and wrinkles. A leave-on mask that helps promote smoother, more hydrated looking skin.