Final answer:
Moisturizing creams contain occlusives and humectants, such as petrolatum, cetyl alcohol, shea butter, and glycerin, to moisturize the skin.
Step-by-step explanation:
In moisturizing creams, a commonly used ingredient to moisturize the skin is occlusives which form a coating on the surface of the skin, keeping moisture from escaping. Another common ingredient is humectants which absorb water, either from the air or from deeper layers of the skin, to moisturize the skin. Some examples of occlusives and humectants found in moisturizing creams are petrolatum, cetyl alcohol, shea butter, and glycerin.