Do silk pillowcases help curly hair? What dermatologists actually say

Dermatology guidance in the UK and the US suggests sleeping on silk or satin if you have curly or Afro-textured hair, to cut friction overnight. No study has tested what a silk pillowcase actually does to your hair. Both things are true, and it helps to know which is which before you buy anything, from us or from anyone else.

What do dermatologists say about silk pillowcases for curly hair?

Two professional bodies have written about it, and their advice lines up.

The British Association of Dermatologists (BAD) published a patient leaflet on caring for Afro-textured hair in July 2023. At bedtime, it suggests loosely plaiting or twisting the hair and covering it with a satin or silk cap or scarf. It adds that sleeping on a satin or silk pillowcase "will achieve the same goal of minimising friction".

The American Academy of Dermatology (AAD) published its curly hair tips in June 2022. It says satin or silk bonnets or pillowcases "may also reduce friction and preserve your hairstyle".

The BAD's leaflet is written for Afro-textured hair, and the AAD's tips for curly hair. The bedtime advice is the same in both.

So both point at the same aim: less friction against your hair while you sleep. Many people with curly or textured hair sleep on silk to help keep their style overnight, and the guidance sits comfortably with that habit.

Do dermatologists recommend silk over satin?

No. Read the wording closely and two things stand out. Both bodies say satin or silk, and neither says silk works better than satin. Neither names a brand, and neither endorses SOIEA. Their advice is about the surface your hair rests on, not about a product.

It is also guidance, not a trial. Expert advice is useful and we take it seriously. It is not the same as a study that put one group on silk and another on cotton, then measured the difference. We looked for one and found none.

Is there any research on silk pillowcases and hair?

Very little, and none of it in a journal. We searched the medical literature and found no published clinical or lab study of silk pillowcases and hair. A search of PubMed for silk or satin together with hair and bonnets, scarves, pillows or sleep returns no papers at all.

The closest thing to a measurement is a statement from TRI Princeton, an independent lab that tests hair and textiles. It says its own work shows lower hair friction on silk than on cotton, but it has not published the figures or the method.

You will see percentage figures on other brands' sites too. Those come from brands testing their own products, unpublished, so we don't repeat them. And nothing shows that any pillowcase prevents breakage, frizz, split ends or hair loss. If a brand promises that, ask to see the study. The hair section of our science page lists every source we read.

Is silk or satin better for curly hair?

Neither has been shown to beat the other. Satin is a weave, not a fibre, and most low-cost satin pillowcases are polyester. Silk charmeuse and polyester satin are both smooth filament fabrics, and the guidance names both.

The weave matters as much as the fibre. A satin face, with long smooth floats, is built to be slippery, whichever fibre it is woven from. That is part of why the advice can treat the two as one.

The differences are in the fabric itself. Silk is a natural protein fibre. In standard conditions it takes up about 11% of its weight in moisture from the air, and polyester satin less than 1%. No one has tested whether that matters for curls, so we won't tell you it does. If you love the feel of a natural fibre, that is a good reason to choose silk. We set out the rest in silk vs satin pillowcases: what is the difference?

How can you look after curly hair overnight?

The BAD's own suggestions are simple, and neither needs a particular product.

• Loosely plait or twist your hair at bedtime.
• Cover it with a satin or silk cap or scarf, or sleep on a satin or silk pillowcase. The leaflet treats either as a route to the same goal.

Whatever your pillowcase is made of, wash it every week. If you choose silk, wash it cool with a pH-neutral detergent that has no enzymes or bleach, skip the tumble dryer, and dry it out of direct sun. Our care guide has the details.

SOIEA is 100% mulberry silk at 22 momme, in champagne and blush, launching in December 2026 for the UK and Ireland. We won't promise more for your curls than the evidence allows: a smooth surface for your hair to move across while you sleep. See the pillowcase.