Final answer:
The peel-off setting mask known for serum absorption, firming, and hydration is called a rubber mask. The correct answer is option: 4) Rubber mask.
Step-by-step explanation:
The setting mask that is used for serum absorption, firming, and hydration, which is also known as a peel-off, is called a rubber mask.
Unlike exfoliating masks, which are designed to remove dead skin cells, or sheet masks and sleeping masks, which typically adhere to the skin to deliver actives over time, rubber masks create a barrier that forces the active ingredients to penetrate deeply into the skin and also lock in moisture.
The mask transforms from a gel-like substance to a rubbery consistency as it dries, and can ultimately be peeled off, hence the name.