La Roche-Posay Effaclar Purifying Mask is a deep cleansing clay mask specially formulated for oily and acne-prone skin. This purifying treatment helps absorb excess oil, unclog pores, and remove impurities while being gentle enough for sensitive skin. This purifying mask contains kaolin clay and La Roche-Posay Thermal Spring Water to help absorb excess oil and purify the skin. The formula is dermatologically tested and suitable for sensitive skin. For best results, apply a thin layer to clean, dry skin, leave on for 5-10 minutes, then rinse thoroughly with water. Use 1-2 times per week or as needed. The product comes in a 100ml tube format.