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Sheet
The superstar of Korean beauty imports is a single-use, thin fabric mask you spread over your face Phantom of the Opera–style. “The sheet, which has been doused in serum, creates an occlusive shield on skin, allowing active ingredients to penetrate deeply without evaporating,” says cosmetic chemist Randy Schueller. For the best results, fellow cosmetic chemist Ni’Kita Wilson recommends masks made of biocellulose, which clings to skin to form the tightest seal.

Best for: Discolored, oily, dull, or dry skin (so, almost everyone).

Try: Rituals Moisture Boost Bio-Cellulose Sheet Mask ($15; Rituals.com)