Silk, Satin and Polyester: What Are the Differences?
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Shop the collection →Silk vs satin vs polyester: a quick comparison
| 100% Mulberry Silk | Satin | Polyester | |
|---|---|---|---|
| What it is | Natural protein fibre | A weave, usually made of polyester | Synthetic fibre from petroleum |
| Feel | Soft, smooth and cool | Slippery with a high shine | Can feel rough and cling with static |
| Hair & skin | Reduces friction, frizz and sleep creases; helps retain moisture | Some friction reduction | Absorbs natural oils; may irritate sensitive skin |
| Breathability | Highly breathable, temperature-regulating | Low | Low, traps heat |
| Longevity | Years, with gentle care | Shorter lifespan | Durable, but lower-quality feel |
| Best for | Hair and skin health | A budget look-alike | Everyday textiles, not sleep |
Our pick: for healthier hair and skin, 100% mulberry silk wins on every count. Shop silk pillowcases →
What is silk, and how is it made?
Silk is a natural fibre spun by insects for their nests and cocoons. The silk reeled from the cocoon of the Bombyx mori silkworm is roughly 70 to 75% fibroin, the strong structural protein, and 20 to 25% sericin, the gum that binds the cocoon together. Lightweight, cool and quietly lustrous, it feels wonderful worn against the skin.
Does polyester really resemble silk?
Not really. Polyester resembles silk about as closely as a tricycle resembles a car. It is a synthetic fibre spun from petroleum, engineered to look like silk without being silk. It is durable, but it does not breathe well and does not absorb moisture, so it can feel hot and clammy on a warm night.
Is satin the same as silk?
No. Satin is a weave, not a fibre. It describes a glossy surface produced by floating four or more threads over one, and that weave can be made from silk, polyester or nylon. So a "satin pillowcase" may contain no silk at all. Silk is the fibre; satin is one way of weaving it, or of weaving something cheaper to look like it. For how the two compare specifically for sleep, see silk vs satin pillowcases.
Why people choose silk
- It is a natural fibre with a smaller chemical footprint in production than synthetics.
- It is lightweight and breathable, so you overheat less.
- It regulates temperature, feeling cool in summer and warm in winter.
- Its smooth, straight fibres give it that characteristic soft touch and gentle sheen.
- It is gentle on skin and hair, creating less friction than cotton or polyester.
The trade-off is honest: silk costs more, and it asks for gentler care. Real silk costs several times what polyester does, and where polyester shrugs off the washing machine, silk prefers a cool hand wash. What you get in return is breathability, temperature regulation and a fibre that is kind to skin and hair rather than one that traps heat and static.
How to tell silk from polyester
Price is the first tell: if the "silk" is too cheap to be true, it usually is. Polyester tends to be woven perfectly evenly, while real silk carries tiny irregularities and slightly twisted threads. Held up to the light, silk shows a subtle sheen that shifts colour with the angle, where polyester shines the same flat way from every direction. For the full step-by-step, here is how to tell if silk is real.
Polyester pillowcase vs silk pillowcase
Both are smoother than cotton, so both reduce friction and split ends. The difference is in everything else. Silk's temperature regulation, hypoallergenic nature and resistance to mould, mildew and dust mites are things polyester satin simply cannot match. It is the difference between a fabric that works with your skin overnight and one that merely sits on it. See also how silk compares with the pillowcase most people already own: silk vs cotton.
If you can, choose silk. It is the better fabric of the three, and the one your skin and hair will thank you for.