REN Glycolactic Radiance Renewal Mask comes in a handy pump bottle with a volume of 75ml. This exfoliating mask renews and improves skin tone and skin texture and is one of the best selling products of the brand REN. It's a gel which leaves a kind of film layer on your skin, the gel doesn't get hard and doesn't dry out, you remove the mask after 10 minutes with lukewarm water along with the included cloth. This mask contains no less than 6.5% glycolic acid (glycolic acid is only effective on the skin as the concentration is 5% or higher). Glycolic Acid ...