Common formats include sheet masks and gel masks, as well as hydrogel and bio‑cellulose sheets, quick peel‑off gels, and overnight (sleeping) treatments.
Treatment times vary: many sheet masks are 5–10 minutes for a quick boost, some masks are designed for overnight use, and certain peel‑off or intensive treatments are intended for weekly sessions.
Some masks are unscented, while others feature light fragrances such as gentle rose or fruit notes (for example, mango).
Brands often display numeric concentrations on their labeling. Examples noted on packaging include niacinamide listed as 20,000 ppm and collagen reported using parts‑per‑billion style figures such as 2,160,000 ppb.
A few hydrogel or bio‑cellulose sheets are described as becoming more transparent as their serums absorb, providing a visual cue that the treatment has been delivered.