You're shopping for a silk pillowcase and you keep seeing numbers like "16mm", "19 momme", "22M", "25 momme." What does it actually mean — and why does it matter?
Momme weight is the most important quality indicator in silk. Get this wrong and you either overpay for unnecessary weight or end up with a pillowcase that degrades in weeks.
What Is Momme (mm)?
Momme (pronounced "mummy" and abbreviated "mm" or "M") is the traditional unit of weight for silk fabric. It measures the weight in pounds of a piece of silk that is 45 inches wide and 100 yards long.
In practical terms: higher momme = heavier, denser, more durable silk. Lower momme = lighter, more sheer, more delicate fabric.
This is different from thread count in cotton, which measures thread density. Momme is a weight measurement that reflects both density and the thickness of individual silk filaments.
Momme Weight Guide: What Each Number Means
6–9 Momme: Very Sheer / Fashion Fabric
Too lightweight for home textiles. Used for scarves, lingerie, and sheer fashion garments. Falls apart quickly with regular use and washing.
12–15 Momme: Lightweight / Entry-Level
Technically "silk" but far too thin for pillowcases. Often found in budget products marketed as silk. Poor durability — begins pilling and degrading within months. Fine to touch initially but doesn't hold up.
16–19 Momme: Mid-Range
The minimum acceptable range for a silk pillowcase. Adequate for light use and occasional washing. Will show wear over 6–12 months of nightly use. Popular price point for mid-tier brands.
20–22 Momme: Premium Range — The Sweet Spot
The ideal range for pillowcases. Heavy enough to be genuinely durable and machine-washable, light enough to remain breathable and temperature-regulating. The weight used by luxury hotels and premium silk brands. Zensation uses 22 Momme — at the high end of this range for extra durability.
25+ Momme: Heavy / Luxury
Very durable and long-lasting, but heavier and less breathable than 22mm. Better suited for duvet covers or luxury apparel than pillowcases. Overkill for most use cases and harder to wash at home.
Momme vs. Grade: Two Different Things
Momme weight tells you how much silk is in the fabric. Silk grade (A, 2A, 3A, 4A, 5A, 6A) tells you the quality of the silk fibers themselves.
Grade 6A is the highest quality grading, indicating:
- Long, continuous filaments (less breakage and texture variation)
- Minimal imperfections in the fiber structure
- Consistent diameter throughout each strand
- Superior luster and smoothness
You need both high momme AND high grade. A 22 Momme Grade 3A pillowcase will feel rougher and degrade faster than a 22 Momme Grade 6A one. Zensation uses Grade 6A — the highest available.
Why Brands Hide Momme Weight
Many brands advertise silk pillowcases without disclosing momme weight. This is a red flag. Brands that don't disclose momme are almost always selling 12–16mm silk and hoping you don't know to ask.
Always filter out any silk pillowcase that doesn't explicitly state momme weight. If it's not disclosed, assume it's low quality.
The OEKO-TEX Factor
Beyond momme and grade, look for OEKO-TEX® Standard 100 certification. This independently verifies the silk is free from over 100 harmful chemicals. Relevant for anyone with sensitive skin or who sleeps on their face (which is everyone using a pillowcase).
Quick Reference: What to Look For
- ✓ Momme: 19–22mm (sweet spot for pillowcases)
- ✓ Grade: 6A (highest quality)
- ✓ Material: 100% Mulberry Silk (not blended, not satin)
- ✓ Certification: OEKO-TEX® Standard 100
- ✓ Closure: Hidden zipper (envelope openings can expose the pillow edge)
Zensation hits all five: 22 Momme, Grade 6A, 100% Mulberry Silk, OEKO-TEX® certified, hidden zipper.