Cyclopentasiloxane:
 
This silicone is used as a conditioner, delivery agent, lubricant and solvent.  It acts as a mild water repellent by forming a protective barrier on the skin. It can also fill in fine lines and wrinkles, giving the face a temporary “plump” look. It is also very easy to spread.

Can be found in the following O Naturals Products: Nourishing Watermelon & Vitamin C Gel Face Mask, Anti-Aging Kiwi & Vitamin E Gel Face Mask, Antioxidant Lemon & Vitamin B Gel Face Mask