Silk pillowcases are judged by momme, a weight measure where 22 momme is the quality benchmark, 19 is a common entry point, and 25 to 30 sits at the heavy, durable end.
Silk has no cotton-style thread count, so momme is the number that predicts how a pillowcase will feel and wear. Get that figure right and confirm the silk grade; miss it and two identical-looking pillowcases can differ wildly in longevity.
What Momme Actually Measures
Momme measures how much silk is packed into the fabric, driving both weight and durability: a higher number means denser silk and a heavier hand-feel, and density resists wear. The scale runs roughly 19 to 30 for pillowcases. LilySilk’s fabric guide explains that momme shows how much silk is used and how durable the finished fabric will be, which is why it outranks thread count for this material. Thread count still appears on some silk labels, but it is a cotton metric—when both numbers are listed, read momme first.
Reading the Momme Range: 19, 22, and 25 to 30
For most shoppers, 22 momme is the sweet spot, 19 momme is a reasonable entry point, and 25 momme and above buys extra heft and longevity.
| Momme Weight | Feel and Durability | Best For |
|---|---|---|
| 19 momme | Lightest common grade; soft but quickest to show wear | First silk pillowcase, warm sleepers, tighter budgets |
| 22 momme | Noticeably denser and heavier; the recognized quality benchmark | Most buyers wanting one pillowcase that holds up |
| 25 momme | Heavy hand-feel with strong resistance to thinning | Frequent washers and daily use |
| 30 momme | Heaviest common weight; closest to a satin-like drape | Maximum longevity and heft |
| Below 19 momme | Thin and generally less durable | Skip unless price is the only concern |
Grade, Fiber, and Certifications to Look For
A quality silk pillowcase states both momme weight and silk grade, and Wirecutter advises avoiding anything below grade 6A. Grade reflects fiber length and uniformity—how the fabric was made, not just how much of it there is. The fiber should be listed as 100% mulberry silk; grade 6A plus 100% mulberry silk is the premium designation, and a label skipping momme or grade gives you nothing to verify.
Silk charmeuse pillowcases can also carry Oeko-Tex Standard 100 certification, confirming the fabric was tested for harmful substances—not a grade claim, but a useful signal for nightly use. Closures matter less: envelope and hidden zipper options are standard across 19, 22, and 30 momme collections, so pick whichever keeps the pillow in place. To compare specific options, this roundup of tested 100 percent silk pillowcase picks lays out models worth considering. Published momme definitions and grade guidance come from LilySilk’s momme and thread count guide.
The Short Version: Three Questions Before You Buy
- Is the momme stated? Look for 19, 22, 25, or 30. No number means no way to judge density.
- Is the grade at least 6A and the fiber 100% mulberry silk? Both should be printed, not implied.
- Is there a certification or care label? Oeko-Tex Standard 100 confirms testing for harmful substances.
Care instructions were not detailed in the sources above, so check the product’s manufacturer page or sewn-in care label before your first wash. Buy 22 momme if you want one purchase to be enough, drop to 19 momme to test whether you like silk, and step up to 25 or 30 momme if you wash often or sleep on it nightly. That single number carries more weight than every other word on the package.
FAQs
Is a higher momme weight always better?
Higher momme means denser, heavier silk that generally resists wear longer, so 25 to 30 momme will outlast 19 momme under the same washing routine. It is not automatically better for everyone: heavier silk feels cooler and more substantial, and some sleepers prefer the lighter drape of 19 or 22 momme.
Why does thread count matter less for silk?
Thread count is a cotton measurement counting threads per square inch and does not translate cleanly to silk. Silk labels use momme to express how much silk is in the fabric, so a listing with both numbers should be judged on momme. Thread count alone tells you very little here.
What does grade 6A mean on a silk pillowcase?
Grade 6A refers to the quality of the silk fibers, based on fiber length and uniformity. Wirecutter advises avoiding silk pillowcases below grade 6A, and grade 6A with 100% mulberry silk is treated as the premium designation. If a label states grade, it should be 6A.
References & Sources
- LilySilk. “What is Momme in silk fabric? What is thread count?” Defines momme as a silk weight and durability measure and explains its relationship to thread count.
- Wirecutter. “My Favorite Hair Care Tool Is a Silk Pillowcase.” Source of the guidance that a quality silk pillowcase should list both momme and grade, and that buyers should avoid anything below grade 6A.
- Good Housekeeping. “Best Silk Pillowcases.” Provides construction and momme examples, including envelope and zipper closures across 19, 22, and 30 momme options.
