Most ‘silk’ pillowcases sold online are polyester in a satin weave — a petroleum-derived fabric that traps heat and drags at hair and skin overnight. This is the same 22 momme mulberry silk used in the Eso World Sleep Mask, made by the same supplier.. Mulberry silk, plant-based dyes, Oeko-Tex Standard 100. Every material on the page.. Made from Mulberry Silk. Free from Polyester labelled ‘satin’, Synthetic and azo dyes, Formaldehyde wrinkle-free treatments, Non-breathable synthetic backing. Pick up any ‘silk’ pillowcase sold online and check the label. The vast majority are polyester in a satin weave — satin is a weave, not a material, and the substitution is easy to miss because the sheen looks similar at a glance. $55.00 — ships internationally from the UK.
Silk Pillowcase
Most ‘silk’ pillowcases sold online are polyester in a satin weave — a petroleum-derived fabric that traps heat and drags at hair and skin overnight. This is the same 22 momme mulberry silk used in the Eso World Sleep Mask, made by the same supplier.
Colour
Quantity
$55.00
Silk Pillowcase
|$55.00Silk Pillowcase
$55.00
Best for:
- — Anyone waking up with a visible sleep crease or tangled, frizzy hair
- — Sensitive or acne-prone skin that reacts to synthetic pillowcase fabric
- — Hot sleepers who want a breathable, moisture-wicking surface
100% mulberry silk
Plant-based, GOTS-compatible
Every material, listed.
The Silk Pillowcase is made from Mulberry Silk.
Mulberry Silk
Face & reverse
The same 22 momme mulberry silk as the Eso World Sleep Mask, from the same supplier. Mulberry silk is a natural protein fibre with the lowest friction coefficient of any common textile (Kaplan & Okur, 2008) — less mechanical drag against hair and skin overnight than cotton or polyester. Naturally hypoallergenic — silk protein resists dust mites, mould, and bacterial colonisation. Temperature-regulating — breathes and wicks moisture rather than trapping heat and sweat the way polyester does.
Pick up any ‘silk’ pillowcase sold online and check the label. The vast majority are polyester in a satin weave — satin is a weave, not a material, and the substitution is easy to miss because the sheen looks similar at a glance. Polyester has a higher coefficient of friction than silk (Kaplan & Okur, 2008) and doesn’t wick moisture the way silk does, which together are the material mechanism behind the tangled hair and sweaty-hot face that synthetic pillowcases are known for. This pillowcase is cut from the same 22 momme mulberry silk as the Eso World Sleep Mask, from the same supplier — the same material against your face that’s already recommended for 8 hours a night.
What we don't use.
The Silk Pillowcase is free from Polyester labelled ‘satin’, Synthetic and azo dyes, Formaldehyde wrinkle-free treatments and Non-breathable synthetic backing. Each exclusion is explained below with the reason.
Polyester labelled ‘satin’
‘Satin’ is a weave, not a material — most pillowcases marketed as silk or satin are polyester. This one is 100% mulberry silk, the same material and supplier as the Eso World Sleep Mask.
Synthetic and azo dyes
Plant-based dyes only. Azo dyes can release carcinogenic aromatic amines under skin contact and perspiration — restricted in the EU but common in imported bedding.
Formaldehyde wrinkle-free treatments
Low-grade imported silk often uses formaldehyde resins for wrinkle resistance — releases formaldehyde with body heat and perspiration over a full night’s contact. GOTS-compatible processing only.
Non-breathable synthetic backing
Some ‘silk’ pillowcases blend or back the fabric with polyester to cut cost, which reintroduces heat-trapping and microplastic shedding on the exact surface that touches your face for 8 hours. This one is 100% mulberry silk throughout.
Eso World vs. typical products.
| Eso World | Typical | |
|---|---|---|
| Material | 100% mulberry silk | Satin (polyester), synthetic silk, or silk/polyester blend |
| Skin & hair contact | Hypoallergenic, lower-friction silk | Synthetic fibre against skin and hair overnight |
| Temperature regulation | Breathes and wicks moisture | Traps heat and sweat |
| Dyes | Plant-based, GOTS-compatible | Synthetic dyes |
Comparison summary: Material: Eso World uses 100% mulberry silk, typical alternatives use Satin (polyester), synthetic silk, or silk/polyester blend. Skin & hair contact: Eso World uses Hypoallergenic, lower-friction silk, typical alternatives use Synthetic fibre against skin and hair overnight. Temperature regulation: Eso World uses Breathes and wicks moisture, typical alternatives use Traps heat and sweat. Dyes: Eso World uses Plant-based, GOTS-compatible, typical alternatives use Synthetic dyes.
Getting started.
Fit it to your pillow
Slide the pillow in the same way as any pillowcase.
Hand wash weekly
Cool water, mild detergent, press dry between towels. Don’t wring silk — it weakens the fibres.
The first 2+ weeks.
Getting used to it
Silk feels different against skin than cotton from the first night — cooler and smoother, not clammy. Some people notice their hair sliding rather than catching on the pillow immediately.
Less morning tangling and creasing
Lower overnight friction against hair and skin means less mechanical stress accumulating night after night, versus higher-friction synthetic pillowcases.
5 questions answered.
Yes — and it’s the single biggest thing to check before buying. Satin is a weave, not a material. Most pillowcases sold as ‘silk satin’ or ‘satin’ are polyester in a satin weave. Real mulberry silk is a natural protein fibre — hypoallergenic, temperature-regulating, with the lowest friction coefficient of any common textile (Kaplan & Okur, 2008). This one is 100% mulberry silk, the same material as the Eso World Sleep Mask.
The mechanism is friction. Cotton has a higher coefficient of friction against hair and skin, which is what causes tangling and the crease line visible each morning. Silk’s lower friction coefficient (Kaplan & Okur, 2008) means less mechanical drag as you move in your sleep.
Hand wash in cool water with mild detergent. Don’t wring — press gently between towels. Air dry flat. Machine washing degrades silk protein fibres.
Yes. Same 22 momme mulberry silk, same supplier, same plant-based dyes.
It’s sized to fit a standard pillow. Exact finished dimensions are being confirmed with the supplier — check back on this page or contact us before ordering if you need a precise measurement for an oversized or specialty pillow.
The bottom line
The Silk Pillowcase is made from Mulberry Silk. Free from Polyester labelled ‘satin’, Synthetic and azo dyes, Formaldehyde wrinkle-free treatments. Every material is published on this page with the research behind each choice.
Kaplan S, Okur A (2008)
Fibres and Textiles in Eastern Europe
Mulberry silk has a lower coefficient of friction than any common textile fibre including cotton, polyester, and nylon. The smooth protein surface reduces mechanical irritation on skin and hair contact. For a fabric in contact with hair and skin for 8 hours nightly, friction coefficient directly determines whether the material causes creasing, tangling, and irritation.
Napper IE, Thompson RC (2016)
Marine Pollution Bulletin
A single polyester garment sheds up to 700,000 microplastic fibres per wash. Natural fibres such as silk and cotton biodegrade; synthetic fibres do not. Polyester ‘satin’ pillowcases are cut from the same shedding synthetic fabric class, in direct overnight contact with skin and airways.
Vepari C, Kaplan DL (2007)
Progress in Polymer Science
Silk fibroin is a natural protein biopolymer whose amino-acid-driven crystalline and amorphous structure underlies its combination of mechanical strength, biocompatibility, and moisture-handling behaviour — properties that differentiate natural silk from petroleum-derived synthetic fibres used in most ‘silk-look’ textiles.
Related reading
Microplastics: Where They Shed and What We Know
Polyester and other synthetic fibres shed microplastic particles under friction — including the fabrics most ‘silk’ pillowcases are actually made from.
Formaldehyde in Fabric Finishes
Wrinkle-resistant treatments on imported textiles release formaldehyde with body heat and perspiration — exactly the conditions on a face for 8 hours a night.
DMDM Hydantoin: The Formaldehyde Releaser
How preservatives that aren’t formaldehyde still release it slowly over time. Same logic as the resin finishes on cheap synthetic ‘silk’.
Fragrance: 3,000+ Substances on a One-Word Label
The same regulatory loophole that lets ‘fragrance’ stay undisclosed lets ‘satin’ stay unspecified — both default to the cheapest synthetic.
What Eso-Friendly Actually Means
It’s a filter, not a certification — published criteria so you can check our work on every product page.
Complete your routine
Hand wash only — machine washing degrades the silk.