This is a praise article for rubber packs, which are a bit more inconvenient than sheet packs but are definitely effective.

The biggest advantage of modeling packs (rubber packs) is that they completely seal the skin, blocking air contact and pushing the active ingredients deep into the skin. Applying a generous amount of your favorite highly concentrated ampoule before applying the mask will double absorption. The cooling sensation and moisturizing effect you feel when you remove it after 15 minutes is unmatched by any expensive mask pack. Be sure to try a modeling pack the day before an important appointment.