Hey Reader!

You know that moment in winter when your skin looks moisturized in the mirror… but two hours later it feels like you applied nothing at all?

That’s TEWL: transepidermal water loss doing what it does every cold season: pulling moisture right out of your skin.

The secret to stopping that midday dryness isn’t more product…
​it’s smarter layering.

Let’s break down the “moisture sandwich,” the winter layering method that helps keep hydration in and dryness out.

Why Winter Skin Needs Layering

Cold weather + dry air = increased water evaporation from the skin. When TEWL rises, even rich moisturizers can’t hang on long enough.

Layering gives your skin multiple forms of support:

• Water-binding ingredients
• Barrier-strengthening layers
• A seal to slow moisture loss

Think of it like dressing for winter, you wouldn’t survive with just one layer, right?

Your skin is the same.

The Winter “Moisture Sandwich” Method

This technique is simple but incredibly effective for stopping TEWL in its tracks.

STEP 1: Start With Damp Skin (Always)

Hydration begins with water. Applying products on damp skin gives humectants something to hold onto instead of pulling moisture from your skin.

STEP 2: Apply a Humectant Layer

Use ingredients that draw water into the upper layers of the skin:

• Glycerin
• Tremella
• Beta-glucan
• Panthenol

This builds the “juicy” part of the sandwich.

STEP 3: Add Your Treatment Layer (Optional)

If you’re using niacinamide, peptides, or lightweight serums, this is where they go. These can help strengthen hydration pathways and support the barrier.

STEP 4: Lock It In With an Emollient Moisturizer

This is your comfort layer, it softens, strengthens, and prevents water from escaping too quickly.

STEP 5: Finish With an Occlusive (If It’s Very Dry Out)

In low humidity, an occlusive can dramatically reduce TEWL.

Good options:

• Petrolatum
• Lanolin
• Balms
• Thick creams

Occlusives act like the outer coat that seals everything in.

Who Benefits Most From Winter Layering?

✔ Skin that feels tight by midday
✔ People in cold, windy, or dry climates
✔ Those experiencing flaking or irritation
✔ Anyone using active ingredients that can increase dryness
✔ Makeup wearers wanting smoother, more hydrated application

If your skin feels “okay” right after moisturizing but dry later, layering is the missing step.

Winter Layering Mistakes to Avoid

✖ Applying humectants to dry skin
✖ Using foaming or stripping cleansers
✖ Skipping moisturizer after hydrating serums
✖ Using only lightweight lotions in cold environments
✖ Relying on one single product to “do everything”

Winter is not the season for minimalism... It’s the season for strategy.

Want To Learn Even More About The Science of Skincare?

Check out these related articles on RelatableSci.com that break down the science of skincare a little more.

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Do you want to read past newsletters? Head over to the archive of all of our previous newsletter series.

Want To Learn Even More About The Science of Skincare?

Check out these related articles on RelatableSci.com that break down the science of skincare a little more.

Do you want to read past newsletters? Head over to the archive of all of our previous newsletter series.

​Relatable Skincare Report Archive​

Stay tuned for my next email. And if you found this interesting, share it with a friend! And if a friend sent this to you and it was helpful, subscribe so that you get it delivered to your inbox next week, and a free routine audit guide to say welcome!

​Subscribe and Get the Free Skincare Routine Audit Guide​

Reply and tell me: Which step of the moisture sandwich do you want help perfecting?

Wishing you a great week,

Allie