A Guide to Nighttime Slugging

Slugging refers to the practice of applying a thin, occlusive layer over the face as the final step of a nighttime routine. The goal is not to nourish the skin with active ingredients but to create a physical seal that prevents moisture from escaping into the environment while you sleep. By trapping hydration within the stratum corneum, you allow the skin to remain supple until morning.

This practice relies on the properties of inert occlusives, which do not penetrate the skin but sit on the surface. When integrated correctly into a simple routine, it acts as a functional buffer against dry air and dehydration.

1. Cleanse thoroughly. Begin with a damp face and a gentle, non-stripping cleanser. Ensure all environmental debris and daily oils are removed from the surface. Pat your skin dry with a clean towel, leaving it slightly damp to the touch.
2. Apply humectants. Apply a water-based serum or a hydrating toner to your damp skin. Humectants like glycerin or hyaluronic acid pull moisture into the surface layers. This step is essential because the occlusive you apply later will trap whatever sits underneath it.
3. Seal the surface. Take a pea-sized amount of petroleum jelly or a balm composed primarily of occlusive waxes. Warm it between your palms until it reaches a manageable, thin consistency. Gently press the product onto the skin rather than rubbing it in, focusing on areas prone to dryness.
4. Allow absorption. Allow the layer to settle for several minutes before making contact with your pillowcase. It is helpful to place a towel over your pillow to protect fabrics from residual product transfer. Go to sleep with the barrier intact.

The objective is to lock moisture in, not to add more substance to the surface.