22 Momme Silk: Quality, Durability, and Impact on Sleep
22 momme silk: what does this number mean, why is it different from thread count, and why does this specific density make all the difference for a sleep mask. The complete guide.
When you read 22 momme silk on a sleep mask label, what does it actually mean? And does it really change anything against your skin at 3am? Yes. Here's why.
Momme and weight: the same idea, two systems
Weight (gsm) measures a fabric in grams per square metre — the standard for cotton, linen, polyester. For silk, Japanese traders historically used momme (abbreviated mm): the weight in pounds of 45.72 metres of fabric at 1.17 metres wide.
The conversion: 1 momme ≈ 4.33 g/m². A 22 momme silk therefore weighs approximately 95 g/m². This isn't just a weight — it's a density. The higher the momme, the tighter, more durable the fabric, and the more capable it is of regulating thermal and moisture exchange.
The momme scale: from 6 to 25
| Momme | Approx. weight | Typical use | Quality |
|---|---|---|---|
| 6 mm | 26 g/m² | Light scarves, chiffon | Very light |
| 12 mm | 52 g/m² | Fine summer garments | Light |
| 16 mm | 69 g/m² | Entry-level pillowcases | Standard |
| 19 mm | 82 g/m² | Comfortable pillowcases | Good |
| 22 mm | 95 g/m² | Sleep masks, premium pillowcases | Optimal |
| 25 mm | 108 g/m² | Structured garments | Dense |
Why 22 momme is the optimal standard for a sleep mask
At 19 momme, the fabric lacks slightly in body: it deforms more easily and light blocking is less consistent. At 25 momme, the fabric becomes perceptibly heavy — a negligible difference on a sheet, but noticeable on the face for 8 hours.
22 momme is the balance point: dense enough to hold its shape and block light, fine enough to breathe, tight enough to maximise the thermal properties of mulberry silk. That's why leading manufacturers all converge on this density for sleep accessories.
Why not 25 momme?
A 25 momme silk mask would be marginally more durable. But against facial skin — a small, sensitive area in constant contact — the extra weight adds nothing. Durability gains a few months. The sensation loses ground. 22 momme is optimised for this specific use.
What momme tells you about fabric hygroscopicity
22 momme silk is hygroscopic: it absorbs up to 30% of its weight in moisture without feeling wet. It regulates micro-humidity around the face overnight — where cotton saturates and synthetics block. The surface stays dry. Temperature stays stable. Sleep isn't disturbed by micro-thermal sensations that, accumulated over 8 hours, make the difference on waking.
This property is intrinsic to mulberry silk — but at 22 momme, fabric density amplifies it. A 12 momme offers this too, but with less effective thermal management per unit of surface area.
How to verify a sleep mask's momme
Most reputable brands state it in the product description. Without the information, a "silk" mask sold under $35–40 rarely uses 22 momme mulberry silk — material costs don't allow for it. The mention 22 momme mulberry silk is a verifiable technical specification: demand it.
The Noctya Sleep Mask is made from 22 momme mulberry silk. To understand why this material changes the sensation against skin, here's the physics behind the softness. And if you're comparing silk, cotton, and satin, this objective comparison gives you the numbers.
What momme for a silk pillowcase: 22, 25 or 30?
On a pillowcase the trade-off is not the same as on a mask. Fabric weight is felt differently when it rests on the pillow rather than on the face, which is why some brands offer silk pillowcases at 30 momme, a weight never used on a worn accessory.
One clarification first, rarely made: no standard defines a momme per product type. Momme is a weight unit, not a product specification. Nobody can say a pillowcase "must" be a given weight. What can be measured is what the market sells — on Amazon.fr in July 2026, silk pillowcases are sold in 19, 20, 22 and 25 momme, and several bedding brands list 30 momme pillowcases.
- 19-20 momme — serious entry level. Smooth and light, marks a little faster, handles repeated washing less well.
- 22 momme — the most common weight, balancing softness, body and price. It is also the sleep mask weight, so the two match.
- 25 momme — denser, more opaque, a heavier drape. You feel the difference unboxing it; you also pay for it.
- 30 momme — the top of the bedding range. Nothing indicates it is softer: past a certain weight you gain mass and durability, not contact comfort.
A higher momme is therefore not automatically a better product. It is a heavier fabric. On a pillowcase washed weekly, density helps absorb the washing — silk loses up to 20% of its strength when wet, and that is when it suffers. But it improves neither the glide nor the coolness, which come from the fineness of the thread, not its weight.