The Biore Self Heating One Minute Mask gives you purified pores in just one minute at a fraction the cost. This unique formula heats on contact with water to open your pores and draw out any impurities such as pore-clogging dirt and oil, then cools to leave skin tightly smooth and refreshed. The Biore one minute mask features a special natural charcoal formula, which is known for its ability to draw out and trap impurities. Use this product up to two or three times a week for deeply cleaned, healthy looking skin that starts at your pores. This 0.25-oz self heating mask (4-count) will purify your pores 2.5x better than a basic cleaner, and it is oil-free, hypo-allergenic and non-comedogenic.