Occlusive ingredients appear to be most beneficial when applied to moist skin and are only effective when they are on the skin since transepidermal water loss (TEWL) returns to normal after removal. Occlusives are sometimes paired with humectants.

Some examples of synthetic occlusive ingredients are:
Paraffin
Squalene
Squalane
Dimethicone
Propylene Glycol

Some examples of natural occlusive ingredient:
Lanolin
Argan oil
Beeswax
Borage seed oil
Safflower oil
Olive Oil
Jojoba Oil
Tamanu Oil