Are satin pajamas hot to sleep in? Polyester satin is not hot to the touch, but it can feel hot and clammy on a warm night, because polyester holds almost no moisture. Silk sleeps cooler. That is the main silk vs satin difference: silk is a fibre, satin is a weave, and most satin pajamas are polyester.
We sell both, so this is not a page that ends with "always buy silk". As of October 2026, 7 of the 27 pieces in our Sleep collection are 100% mulberry silk. Another 16 are satin, satin-finish or satin-touch fabrics that are not silk, and 15 of those list polyester as the fibre. Below is how each one sleeps, what each one is, and how to tell which one you are looking at.
Are satin pajamas hot to sleep in?
Polyester satin pajamas can sleep hot, because the fibre takes up almost none of the moisture your skin gives off at night. The figures are standard ones. Sara Kadolph's textbook Textiles, quoted in the fibre table of Wikipedia's yarn conditioning entry, lists the moisture regain of polyester at 0.4–0.8% of its weight and silk at 11%. Moisture regain is how much water a dry fibre picks up from the air. On a cool night the gap barely shows. On a warm, humid night, polyester satin leaves the damp on your skin, and that reads as hot and sticky. Weight adds to it. Our First Light Set is woven polyester satin at 121–140 g/m², which is more cloth than our 19-momme silk at about 82 g/m². For a warm night we point people to the Cool It Slip, a cool-touch knit at 81–100 g/m², or to 16-momme silk such as the Plain English Silk Slip.
What is the difference between silk and satin?
Silk is a fibre and satin is a weave. Silk is a natural protein fibre. Mulberry silk comes from the cocoons of the domesticated silkworm, Bombyx mori, and it is unwound as one long filament. Satin is a way of weaving. According to Wikipedia's satin weave entry, four or more yarns float over a single crossing yarn before they interlace, which leaves a smooth, glossy face and a duller back. Long filaments such as silk, polyester and nylon can all be woven this way. When cotton is woven like this, the cloth is usually called sateen. Silk woven as satin is called charmeuse, and Wikipedia's units of textile measurement entry gives its usual weight as 12 to 30 momme. So silk satin and polyester satin can look almost the same in a photo and still be different fabrics on your skin.
| What changes | Mulberry silk | Polyester satin (woven) | Satin-finish knit |
|---|---|---|---|
| What it is | A natural protein fibre from silkworm cocoons | Polyester filament woven as satin | Yarn looped into a knit, then finished to a shine |
| Moisture regain (fibre) | About 11% of its weight | 0.4–0.8% | 0.4–0.8% when the yarn is polyester |
| Stretch | None | A little, if spandex is added | More give |
| First touch | Cool and smooth | Smooth and slippery | Smooth, and cool-touch versions feel cool on contact |
| Warm, humid nights | Stays drier | Can feel clammy | Dries quickly, but can still feel clammy |
| Creasing | Creases | Creases where you fold it | Creases less |
| Care in our range | Cool hand-wash, silk-friendly detergent, no wringing | Cool hand-wash, no wringing, dry out of the sun | Cool hand-wash, no soaking, hang to dry |
| Our examples | The Real Thing Silk Slip, Plain English Silk Slip | First Light Set, Two Acts Set | Cool It Slip, Sleeping In Set, Nightcap Set |
Satin vs silk pajamas: what actually changes at night?
Moisture, fit and care change, and moisture matters most. Silk holds about 11% of its own weight in moisture, and polyester holds under 1%. Your body gives off a little moisture all night. Silk takes some of it up. Polyester leaves it on the surface, which is why polyester satin can feel cool when you put it on and sticky a few hours later on a warm, humid night.
The second change is fit. Our silk has no stretch at all, so it is cut relaxed and it runs small. Many of our satin pieces have 4 to 5% spandex or elastane in them, so they give a little when you turn over. The third is care. Wikipedia's silk entry notes that silk loses up to 20% of its strength when wet, and it does not like heat, strong sun or harsh detergent. Polyester is the tougher fibre, but our satin care notes still ask for a cool hand-wash, because satin, in their words, bruises easily. In a cool bedroom the gap between the two is small. It shows on warm nights and over years of washing.
What is our satin actually made of?
Our satin is polyester, almost always, and every one of our satin pages says "Not silk." in the fabric note. The First Light Set, a robe and slip, is listed as 95% polyester satin. The Two Acts Set is a cool-touch polyester satin. The Room Service Set robe is 95.3% polyester and 4.7% elastane. The Court of One Set, Trailing Off Slip, Late Start Robe and Lash Line Lace Slip are 95% polyester and 5% spandex. The Nightcap Set does not list its fibre, but its fit note says it straight: "It is a satin knit, not silk."
Weight is not the same as quality either. The satin in our Loose Ends Slip is listed at 121 to 140 grams per square metre, which is heavier than our 19-momme silk at about 82. Heavier does not mean it breathes better. We tell you this because polyester satin does not breathe the way silk does, and you would find that out on the first warm night anyway. What polyester satin does well is look good, hang well, cost less to replace and give a little where spandex is added. For a set you lounge in, read in bed in or get ready in, those are good reasons to choose it.
Are cool-touch satin pajamas cool to sleep in?
Cool-touch satin feels cool when you lie down, but it does not stay dry the way silk does. Five of our pieces are described in their listings as cool-touch. The Two Acts Set, Cool It Slip, Nightcap Set and Sleeping In Set are satin or satin-finish. The Long Story Slip is a cool-touch knit without the satin finish. Cool-touch describes how a fabric feels when it first meets your skin, cooler than the air around it. It is a real difference when you get into bed on a warm night.
What cool-touch does not do is change the fibre. Four of those five list polyester, and polyester still holds little moisture. So cool-touch helps most if you feel hot when you lie down and settle once you are asleep. If you wake up damp, silk or modal is the better choice. Modal is made from wood pulp and, unlike polyester, it takes up moisture; our Second Nature Slip is modal. We compare the options side by side in best sleepwear for hot sleepers.
Woven satin or satin-finish knit: how do you tell them apart?
Pull the fabric across its width: a knit gives, and a woven satin barely moves. Woven satin is made on a loom, with long floats of yarn across the face. It has little give unless spandex is added, it creases, and it has the glossy front and duller back described above. A satin-finish knit is made by looping yarn, the way a T-shirt is made, and then finished so the face shines. It stretches more, creases less and usually dries faster. In our range, the Cool It Slip, Crossed Wires Slip, Nightcap Set and Sleeping In Set are satin-finish knits. The pieces we list simply as satin, such as the First Light Set, Loose Ends Slip and Court of One Set, are the woven kind.
You can also turn the fabric over: woven satin is duller on the back. None of this tells you whether something is silk, though. For that, see how to tell if silk is real.
Which should you choose: silk or satin pajamas?
Choose silk if you run warm or wake up damp, if you want the fabric itself to be the point, and if you are happy to hand-wash in cool water. Every silk sleepwear piece we sell lists its momme, and you can browse them in our silk collection. Choose polyester satin if you want the look and the drape for less, you sleep in a cool room, or you want a little stretch. Choose a satin-finish knit if you want the shine with more give and faster drying.
Choose neither if what you want most is the easiest care. Our silk vs cotton sleepwear comparison covers the low-fuss option. Whichever you pick, check the size note first: most of our sleepwear runs small, and each page says so. Silk, satin and the rest are all in Sleep. If you are still deciding whether silk is worth the extra care, are silk pajamas worth it works through the cost per night. For washing, see how to wash satin pajamas and how to wash silk sleepwear.
FAQ
Can you wear satin pajamas in winter?
Yes, in a heated room. Woven polyester satin is a closed, smooth cloth, and heavier satin such as our First Light Set at 121–140 g/m² has more body than light silk. Add a robe or a heavier duvet in a cold room. Layering for winter is covered in are silk pajamas warm in winter.
Do satin pajamas snag easily?
They can. Satin's long floats catch on rough nails, rings, zips and hook-and-loop fasteners. Wash satin alone or with smooth items, and take off jewellery before you put it on. If a thread does pull, ease it back from the wrong side rather than cutting it. The method is in how to fix a snag in silk.
Why do satin pajamas cling with static?
Polyester holds little moisture, so in dry, heated air it builds static more readily than silk or cotton, and it clings. A more humid room, a damp hand run over the fabric, or a different layer underneath helps. The causes and fixes are in how to stop static in satin sleepwear.
How can you tell silk satin from polyester satin without a label?
A burn test on a loose thread is the clearest check. Silk burns slowly, smells like burnt hair and leaves a soft ash you can crush. Polyester melts, smells like plastic and leaves a hard bead. Take the thread from an inside seam allowance, hold it over a sink, and never test a garment you plan to return.
Aniya writes Darette's fabric, fit and care guides. Fibre, weight, cool-touch and care details are taken from our product listings on 12 October 2026.
