The complete guide
How to Choose a Silk Sleep Cap That Actually Stays On
The problem with cotton at 3am
Most of us never think about what our hair does overnight. We just notice the result in the morning: a flattened side, a tangled patch at the back, frizz where there was none when we went to bed.
Cotton is the usual culprit. It is a lovely fabric for a shirt, but under a head that shifts position forty times a night it behaves like very fine sandpaper. The surface is uneven at a microscopic level, and hair catches on it. Cotton also pulls moisture out of whatever touches it, which is great for a towel and less great for hair you have just conditioned.
Silk is a different proposition. The fibre is long, smooth and uniform, so woven silk has far less texture for hair to snag on. Strands slide across it. That is the whole idea behind a mulberry silk bonnet, and it is why people who try one tend to keep using it.
What momme actually tells you
If you shop for silk at all, you will run into the word momme. It is a weight measurement, roughly the weight in pounds of a 45 inch by 100 yard piece of the fabric. In practice it works as a shorthand for how substantial the silk is.
Low momme silk, say 12 to 16, is thin. It feels light in the hand and it is cheaper to make. It is not useless, but it wears out faster and it can look a bit limp.
The 19 to 25 range is where most good silk bedding sits. This cap is 22 momme, which is comfortably in that band. You notice it when you pick the cap up. It has weight and drape, it does not cling to itself with static, and it holds its shape after washing rather than going slack.
Above 25 momme the silk gets heavy and expensive, and for a sleep cap that is more than you need. Twenty-two is a sensible place to land for a 22 momme silk bonnet you intend to wear most nights.
Lined versus silk both sides
This is the detail that separates genuinely good caps from the ones that disappoint.
A lot of bonnets on the market use a silk or satin lining with a synthetic outer shell. While the lining sits perfectly flat against your head, that is fine. But caps move. They ride up, they twist, the edge rolls. The moment the shell makes contact with your hairline or your neck, you are back to friction.
This cap is 100% mulberry silk on both faces. There is no shell, no hidden polyester, no surprise. Whichever way the fabric lands, hair meets silk. That is the main reason people hunting for the best double sided silk bonnet pay a bit more for it.
It also means the cap washes evenly. Mixed-fibre items often shrink or distort because the two fabrics respond differently to water and heat. A single fibre throughout behaves predictably.
Shape, and why pleats help
Bonnets come in a few broad shapes. The plainest is a simple gathered circle with elastic, essentially a soft shower cap. It works, but it looks like what it is and it can flatten hair against the crown.
This one is pleated at the crown with a bow at the front. The pleating does two jobs. It gives the cap volume, which matters if you have thick hair, curls you want to keep, or a bun you need to accommodate. And it makes the cap look deliberate rather than functional, which is a real consideration if anyone else is going to see you in it.
The bow sits at the front. It is a styling detail, not a fastener. The actual holding is done by elastic at the back of the head, which is the better place for it. Elastic across the forehead presses into skin and leaves a line. Elastic at the nape is out of the way and gives the cap something to anchor against.
A pleated silk night cap also packs well. The pleats compress flat and spring back, so it survives being squashed into a suitcase.
Who this suits
Long hair. If your hair reaches past your shoulders, overnight tangling is a constant annoyance. Coiling it up loosely and tucking it into the crown keeps it contained and stops it wrapping round your neck.
Curls and coils. A sleep cap is a standard part of many curly routines, mainly for keeping hair off rough bedding and preserving shape between wash days. The volume in the pleated crown helps here.
Anyone who uses overnight treatments. If you put oil or a mask in before bed, a cap keeps it off your pillow. That alone saves on laundry.
Travellers. Hotel bedding is a lottery. A lightweight silk night bonnet in your bag means at least your head is sorted wherever you end up.
People buying presents. It arrives in a gift box, which sounds minor until you are wrapping things at 11pm the night before.
Getting the fit right
One size with elastic covers most adult heads, and this cap measures about 28 x 23 cm (11 x 9 in) laid flat. If you are unsure, take a tape measure around your head just above your ears and compare.
Putting it on, start at the front hairline and pull it back over the crown, tucking hair in as you go rather than cramming it in at the end. Settle the elastic at the nape, not on your neck and not up on your skull. If the cap tends to creep up in the night, sitting it a little lower at the back usually fixes it.
Very fine or freshly washed hair is slippery and can work its way out. A loose plait or a soft scrunchie before you put the cap on gives it something to hold.
Looking after it
Silk is not fragile, it is just particular. The rules are short.
Wash in cool water with a mild detergent made for delicates. Hand washing is kindest, but a machine on a delicate cycle with the cap inside a mesh bag works fine. No bleach, no fabric softener. Softener coats the fibre and takes away the exact smoothness you paid for.
Do not wring it. Squeeze gently, or press it between a towel. Reshape the pleats with your fingers while it is damp, then dry it flat or on a hanger somewhere out of direct sun and away from a radiator. Heat is what kills silk and elastic both, so skip the tumble dryer.
If it needs pressing, lowest silk setting, inside of the fabric, keep moving. Usually it does not need it.
How often to wash depends on what you put on your hair. Heavy oils and creams mean weekly. Clean dry hair with little product can stretch to a fortnight.
The short version
You are looking at a sleep cap made from 100% mulberry silk at 22 momme, silk on both sides, in a soft light plum pink. It has a pleated crown with a bow at the front, elastic at the back, and it measures about 28 x 23 cm (11 x 9 in) in one size. It washes by hand or machine and comes in a gift box.
The reason to choose it over a cheaper bonnet comes down to two things. The silk goes all the way through rather than being a lining, and 22 momme is heavy enough to last. Everything else is shape and colour, and those are down to taste.
Wash it gently, keep it away from heat, and it will do its quiet job night after night.