Some silk pillowcases have zippers and some use an envelope closure, and neither is automatically better. An envelope has no hardware at all, so there is nothing to snag your hair or scratch your cheek, but it can gape or let the pillow slide out as you move. A zipper holds the pillow snug and keeps the silk taut, but only if the zipper is hidden and placed on the short edge, where your face never touches it.
I am Erin Wise, founder of Wink Silk. I chose a hidden zipper for our double-layer pillowcase, and I will explain why. But I will also tell you when an envelope is the better call, because for plenty of people it is.
Do silk pillowcases have zippers?
Many do. Among the brands I checked on September 29, 2026, closures split roughly down the middle:
| Brand | Closure | Momme |
|---|---|---|
| Blissy | Hidden zipper | 22 |
| Quince | Zipper | 22 |
| Slip | Invisible zipper or envelope | 22 |
| Mulberry Park Silks | Envelope or hidden zipper | 22 |
| Lilysilk | Envelope and hidden zipper | 19, 22 and 25 sold |
| Brooklinen | Envelope | 22 (per its blog) |
| Clementine | Envelope | 22 |
| Fishers Finery | Envelope, no zipper | 25 (also 19, 30) |
| Wink Silk Douceur Doublure™ | Hidden zipper | 25 |
So if you have a strong preference, you have good options either way. Several brands sell both, which tells you the industry has not settled this either.
The case for an envelope closure
An envelope closure is just an extra flap of fabric at one end. You tuck the pillow in, fold the flap over, and that is it.
What an envelope does well
- No hardware. Nothing metal or plastic anywhere near your face or hair. Nothing to snag a curl, catch a lash extension, or leave a pressure line on your cheek.
- Simpler to wash. No teeth to catch the fabric in the machine, nothing to break.
- Nothing to fail. A seam is a seam. There is no pull to wear out or teeth to separate.
Where an envelope falls short
The flap relies on the pillow's own pressure to stay closed. If you move a lot in your sleep, flip your pillow, or use a pillow slightly smaller than the case, the envelope can gape open. Over a few weeks the pillow can work its way out of the end. You wake up with your face on half silk, half bare pillow. (Not the morning you paid for.)
Silk is slippery. That is the whole point of it. But it also means the fabric can shift more than cotton, and a loose envelope gives it room to do exactly that.
The case for a zipper closure
A zipper closes the pillowcase completely, so the pillow is held inside and the silk stays pulled flat across the surface.
What a zipper does well
- A snug, taut surface. When the silk is stretched evenly over the pillow, there are fewer wrinkles and bunches under your face. The smooth surface you paid for stays smooth.
- The pillow stays in. No gaping, no creeping, no half-bare pillow at 3 a.m.
- A cleaner look on the bed. Nothing tucked, nothing peeking.
Where a zipper can go wrong
A badly made zipper is worse than no zipper. If it is exposed, it can snag hair. If it is bulky or sewn along the long edge, it can leave a ridge you feel through the silk. Cheap zipper teeth can also catch the fabric around them.
That is why the details matter more than the choice itself. A good zipper on a silk pillowcase should be:
- Hidden under a fabric flap, so no teeth touch your skin or hair.
- On the short edge of the pillowcase, at the end, well away from where your face rests.
- Flat and fine, so it does not leave a ridge you can feel.
Why I chose a hidden zipper for Douceur Doublure
When I was designing our Douceur Doublure™, a double-layer Performance Luxury Silk™ pillowcase in 25 momme, Grade 6A, 100% mulberry silk charmeuse, I chose a hidden zipper for one reason: envelope closures can slip, and I wanted the pillow to stay put and the silk to stay taut all night. So the zipper is hidden under a fabric flap, where your face and hair never meet it.
I also hid something in there. Every Douceur Doublure is hand-numbered, and the stitched "No. ___ of 330" sits inside the zipper flap. You will not see it on the bed. You find it the first time you unzip it. There are 330 of them, and we will not make more.
For me, the closure is part of a bigger question. After my CLL diagnosis at 44 and the MCAS that followed treatment, I need to know exactly what touches my skin. That is why our silk is certified by our manufacturer: OEKO-TEX Standard 100 certificate BJ025 172302 (TESTEX) and GOTS license GOTS-16032. Wink Silk is pursuing its own GOTS Trader and OEKO-TEX certifications. You can check every number on our certifications page.
Who should choose which
Choose an envelope if
- You are a still sleeper and your pillow fills the case well.
- You want zero hardware of any kind, full stop.
- You want a lower price. Fishers Finery sells a 25 momme envelope pillowcase at $59.99 for a queen, which is an honest way to try heavier silk.
Choose a zipper if
- You toss, turn, or flip your pillow during the night.
- You want the silk held taut so the surface stays smooth.
- You are willing to check that the zipper is hidden and on the short edge before you buy.
If you have curly hair or hair extensions, either works, as long as a zipper is fully covered. Exposed teeth are the thing to avoid. For more on what separates a well-made pillowcase from a pretty one, see what to look for in a high-quality silk pillowcase.
Care tip: close the zipper before washing
This is the single easiest thing you can do for a zippered silk pillowcase. Zip it closed, turn it inside out, and put it in a mesh laundry bag. Open zipper teeth are an easy way for silk to get snagged in the wash, and a closed zipper cannot catch anything. (It takes two seconds. Less time than finding the mesh bag.) The full routine is in how to wash a silk pillowcase.
Envelope pillowcases need the same gentle care, minus the zipper step. Either way, denser silk has more fiber to wear through and tends to hold its surface longer through washing. How long it lasts depends on how you treat it, and how to make a silk pillowcase last longer covers the rest.
Unzip yours and find your number. 330 hand-numbered pieces, early access November 2.
Frequently Asked Questions
Is a zipper or envelope better for a silk pillowcase?
It depends on how you sleep. An envelope has no hardware, so nothing can snag hair or scratch your cheek, but it can gape or let the pillow slide out if you move a lot. A zipper holds the pillow snug and keeps the silk taut, as long as it is hidden under a flap and placed on the short edge, away from your face.
Do silk pillowcases have zippers?
Many do. Blissy uses a hidden zipper and Quince uses a zipper. Slip and Mulberry Park Silks offer both zipper and envelope versions. Fishers Finery, Clementine and Brooklinen use envelope closures. Wink Silk's Douceur Doublure uses a hidden zipper. If you want a zipper, look for one described as hidden or invisible.
Can a zipper on a silk pillowcase snag your hair?
An exposed zipper can. That is why the zipper should be hidden under a fabric flap and placed on the short end of the pillowcase, where your head does not rest. A well-placed hidden zipper does not touch your hair or skin during the night. If you want zero risk of hardware contact, choose an envelope closure instead.
Why does my silk pillowcase keep slipping off?
Silk is smooth, so it slides more easily than cotton. With an envelope closure, movement during sleep can work the flap loose until the pillow creeps out. Make sure the pillow fills the case fully, or switch to a zippered pillowcase, which holds the pillow in and keeps the silk stretched flat across the surface.
How do you wash a silk pillowcase with a zipper?
Close the zipper first, then turn the pillowcase inside out and place it in a mesh laundry bag. Wash on a gentle cycle in cool water with a pH-neutral detergent made for silk, and air dry away from direct sun. Closing the zipper keeps the teeth from catching the silk in the machine.
