If you’ve been shopping for silk pillowcases, you’ve probably seen numbers like “19 Momme,” “22 Momme,” or “25 Momme” — but what do they actually mean? Understanding what Momme is in silk is the single most important factor in determining whether you’re getting genuine, high-quality silk or a cheap imitation.
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What Does Momme Mean?
Momme (pronounced “mum-mee”) is the traditional Japanese unit used to measure the weight and density of silk fabric. It’s similar to thread count for cotton, but instead of counting threads, Momme measures the weight per unit area of the silk.
The higher the Momme number, the more silk fiber is packed into each square inch — which means the fabric is denser, more durable, and more luxurious.
How Is Momme Calculated?
One Momme equals approximately 4.340 grams per square meter. The standard measurement is taken on a piece of fabric that is 100 yards long and 45 inches wide:
| Momme Weight | Weight (g/m²) | Typical Use |
|---|---|---|
| 12-16 Momme | 52-69 g/m² | Scarves, linings, lightweight garments |
| 19 Momme | 82 g/m² | Entry-level silk pillowcases |
| 22 Momme | 95 g/m² | Premium silk pillowcases (sweet spot) |
| 25-30 Momme | 108-130 g/m² | Luxury bedding, heavyweight silk |
19 Momme vs 22 Momme vs 25 Momme
19 Momme Silk
The most common and affordable silk weight. It’s genuine silk, but thinner and less durable. Expect it to last about 6-12 months with regular use before showing signs of wear. Fine for occasional use or if you’re trying silk for the first time.
22 Momme Silk
The optimal balance of luxury, durability, and value. The tighter weave provides better silk pillowcase benefits for hair and skin, lasts 2-3 years, and feels noticeably more substantial than 19 Momme. This is what we use for all xmomoshop pillowcases.
25 Momme Silk
Very luxurious and heavy — almost too thick for a pillowcase. While extremely durable, the extra weight doesn’t proportionally increase benefits. You’re paying a premium for diminishing returns. 25+ Momme is better suited for silk sheets and duvet covers.
Why 22 Momme Is the Sweet Spot
- Durability: 22 Momme lasts 2-3x longer than 19 Momme
- Smoothness: Tighter weave = smoother surface = better for hair and skin
- Breathability: Still lightweight enough for comfortable sleep
- Value: The price jump from 19 to 22 is modest; from 22 to 25 is steep
- Opacity: 22 Momme is fully opaque; 19 Momme can be slightly sheer
What Is 6A Grade Silk?
Momme measures weight, but silk also has a grade that measures quality. The grading system runs from A to C, with A being the highest. Within Grade A, there are sub-grades: 6A (longest fibers, highest quality), 5A, 4A, down to 1A.
6A Grade means:
- Longest continuous silk fibers (stronger, less pilling)
- Uniform color with no impurities
- Highest luster and smoothness
- Minimal breakage during weaving
All xmomoshop pillowcases use 6A grade mulberry silk at 22 Momme. To learn how this factors into your buying decision, see our silk pillowcase buying guide.
How to Verify Silk Quality
- Check the Momme: Reputable sellers always state the Momme weight. If it’s not listed, assume it’s low.
- Feel the surface: Genuine silk feels cool to the touch and has a natural, irregular luster (not a uniform plastic shine).
- Burn test: Real silk burns slowly, smells like burning hair, and leaves a brittle black ash. Synthetic fibers melt into a hard bead.
- Look at the weave: 22 Momme silk should be tightly woven and opaque — you shouldn’t see through it when held up to light.
Buyer beware: Many products labeled “silk pillowcase” on marketplaces are actually satin (polyester) or blends. Always check for “100% mulberry silk” and the Momme weight. Compare silk vs satin in our detailed comparison.
🛍️ Recommended 22 Momme 6A Silk Pillowcases
All xmomoshop pillowcases are verified 22 Momme, 6A grade, 100% mulberry silk.
FAQ
Is higher Momme always better?
Not necessarily. For pillowcases, 22 Momme is the sweet spot. Going higher (25+) adds cost and weight without proportional benefits. Going lower (19) sacrifices durability and smoothness.
What’s the difference between Momme and thread count?
Thread count counts the number of threads per square inch (used for cotton). Momme measures the weight of silk per standard area. They’re different measurement systems for different fabrics.
Can I trust products that don’t state the Momme weight?
Generally no. Reputable silk brands always specify Momme weight. If it’s missing, the silk is likely low quality (16-19 Momme) or not pure silk at all.