Silk and satin are often used as if they mean the same thing. They don't. One is a fibre, the other is a way of weaving. Knowing the difference helps you understand what you are actually buying when you choose pyjamas, and why the prices can be so far apart.
The short answer
Silk is a natural fibre made by silkworms. Satin is a weave: a way of interlacing threads so that one side of the fabric is smooth and glossy. Satin can be woven from silk, but most satin sold today is woven from polyester or other synthetic fibres.
So "silk satin" is real silk with a satin finish, while "satin pyjamas" without the word silk are almost always synthetic.
What is silk?
Silk is a protein fibre spun by silkworms as they make their cocoons. The finest and most widely used is mulberry silk, produced by silkworms fed on mulberry leaves. Its long, even fibres give the fabric its smooth hand, soft drape and gentle sheen.
Because it is a natural fibre, silk breathes. It moves with the body, feels light against the skin, and is naturally temperature regulating, which is why so many people choose it for sleepwear that is comfortable in warm and cool months alike.
What is satin?
Satin describes how a fabric is woven, not what it is made of. In a satin weave, threads float over several others before passing under one, which leaves a smooth, reflective surface on the front and a duller back.
That weave can use silk, but it is far more often made from polyester, nylon or acetate. These fibres are less expensive and very easy to care for, which is why synthetic satin is common in high-street sleepwear.
Silk vs satin at a glance
| Silk (e.g. mulberry silk) | Satin (usually polyester) | |
|---|---|---|
| What it is | A natural protein fibre | A weave, usually of synthetic fibre |
| Feel | Soft, fluid, light | Slippery, glossy, can feel heavier |
| Breathability | Breathes naturally | Breathes less; can feel warm |
| Sheen | Soft, pearly lustre | Bright, high shine |
| Care | Gentle: cold, delicate wash, air dry | Easy: most can be machine washed |
| Price | Higher | Lower |
How to tell them apart
- Read the label. Real silk will say "100% silk" or "100% mulberry silk". "Satin", "silky" or "silk feel" on its own usually means a synthetic fabric.
- Look at the sheen. Silk has a soft, pearly glow that changes with the light. Synthetic satin tends to have a flatter, brighter shine.
- Feel it. Silk warms quickly to your touch and feels light. Polyester satin often stays cool and slippery and can feel heavier.
- Check the price. Mulberry silk is a premium natural fibre. A full silk pyjama set at a very low price is worth a second look at the label.
Which is better to sleep in?
It depends on what matters to you. Synthetic satin is affordable and easy to wash, and it gives the glossy look many people love. Silk costs more and asks for gentler care, but it is breathable and natural, and it feels lighter on the body through the night.
If you tend to feel warm at night, or you want sleepwear made from a natural fibre, silk is the one to choose.
Caring for silk
Silk lasts beautifully when it is treated gently. Hand wash cold or machine wash cold on a delicate cycle, air dry only and never tumble dry, and steam or iron on a low silk setting. Between wears, simply airing silk helps keep it fresh. For full guidance, see our care guide.
Rêve silk
Every Rêve silk piece is made from 100% mulberry silk, sourced from Italy and made in North Macedonia. Explore our silk pyjamas, robes and nightdresses, or read more about our materials.