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Last updated: · By: Austin Cole
If you've been researching silk bed sheets, you've likely seen the term “6A grade” or “6A+ mulberry silk” and wondered what it actually means. Is it just marketing language, or does it reflect a real difference in quality? The short answer: it's a genuine grading system, and understanding it can help you avoid paying premium prices for lower-quality silk or polyester imitations. At Promeed, we focus on transparency, so here's what 6A grade silk means for your sleep.
Quick Answer: 6A grade is the highest classification for raw mulberry silk filaments, indicating the longest, finest, and most uniform strands. For bed sheets, 6A+ silk like our 23-momme set delivers smoother, stronger, and more lustrous fabric that resists pilling, regulates temperature, and feels noticeably soft against skin and hair.
Silk grading starts with the raw silk filament, the continuous thread spun by silkworms (specifically Bombyx mori mulberry silkworms). The grade reflects fiber length, uniformity, cleanliness, and luster. The scale runs from A (lowest) to 6A (highest), though many mills now use a “+” to denote even finer batches. Here's how the grades break down:
Why does fiber length matter? Longer filaments require fewer joins, so the yarn is stronger and smoother. Short fibers create weak spots that can lead to pilling and a rough feel after washing. With 6A+ silk, the fabric tends to stay silky longer rather than losing its feel after a few washes.
Bed sheets are in direct contact with your skin and hair for 7–9 hours every night. That constant friction can contribute to sleep creases, hair breakage, and moisture loss. Lower-grade silk or polyester “satin” cannot replicate the benefits of 6A+ mulberry silk. Here's what the top grade actually delivers for your sleep sanctuary:
One thing to note: “mulberry silk” is not automatically 6A. Some brands use 3A or 4A mulberry silk and market it as luxury. Always look for the grade claim from a reputable seller. At Promeed, we specify 6A+ because we believe transparency builds trust.
Grade tells you about fiber quality, but momme (pronounced “moe-me”) tells you about fabric density and weight. The higher the momme, the denser and more durable the silk. Typical silk pillowcases are 16–19 momme; luxury sheets range from 19–25 momme. Here's a comparison:
| Momme | Feel & Durability | Best For |
|---|---|---|
| 12–16 | Sheer, delicate, prone to wear | Accessories, lingerie |
| 19 | Lightweight, soft, but thinner | Pillowcases, summer sheets |
| 22 | Balanced weight, decent durability | Everyday bedding |
| 23 | Heavyweight, luxurious, long-lasting | Premium sheets (our choice) |
| 25–30 | Ultra-heavy, hotel-grade, less breathable for some | Maximum durability |
We chose 23-momme for our flagship sheet set because it hits the sweet spot: substantial enough to drape beautifully and resist wear, yet breathable enough for all-season comfort. A 19-momme sheet may feel thinner, while a 30-momme sheet can feel heavy and less breathable for some sleepers. With 23-momme 6A+ silk, you get a balance of weight, softness, and thermal regulation. Learn more about the difference between a flat sheet and fitted sheet in our guide Flat Sheet vs Fitted Sheet: Why You Need Both for Perfect Silk Bedding.
The internet is full of “silk” sheets that are actually polyester satin or low-grade blends. How can you tell if you're getting true 6A+ mulberry silk? Use these checks:
Our 23mm 6A+ 100% Mulberry Silk Flat Sheets Set 4pcs was designed for the modern professional who wants hotel-quality sleep without the hotel price tag. The 4-piece set includes:
Every piece is made from 23-momme 6A+ mulberry silk in a range of calming, quiet-luxury shades: champagne, dusk, gold, grey, and white. These neutral tones fit any urban sanctuary aesthetic — no loud logos, just natural fiber. If you prefer an even heavier silk, explore our 30mm 6A+ Mulberry Silk Flat Sheets Set. For a thoughtful gift, consider our 23mm 6A+ Silk Flat Sheets Set Gift Kit, suitable for weddings or housewarmings.
If you are refreshing your sleep routine, upgrading to silk sheets is a small change that can noticeably improve comfort. To keep your 6A+ silk sheets feeling their best, follow these care guidelines:
With proper care, high-grade silk tends to soften slightly over time, while lower grades may feel stiff or pill.
Yes, 6A is the highest official grade for raw mulberry silk. Some mills add a "+" to denote batches with exceptionally long and uniform fibers. Promeed uses 6A+ for our bedding.
6A+ is not a separate official grade but a quality claim by mills that their silk exceeds standard 6A parameters, often with longer fiber length and higher purity. Both are excellent, but 6A+ indicates an extra level of refinement.
No, momme and grade are independent. Momme is fabric density; grade is fiber quality. You can have 6A silk at 19 momme or 30 momme. We chose 23-momme for the best balance of durability and breathability.
Look for a clear statement of “100% mulberry silk” and a specific grade (6A or 6A+). Check for OEKO-TEX® certification. Buy from reputable brands like Promeed that provide transparent product details and clear return policies.
Yes. Mulberry silk is naturally breathable and moisture-wicking. The 23-momme weight allows air circulation, which can help regulate body temperature throughout the night.
Understanding what 6A grade silk means can help you make a more informed purchase — one that prioritizes your skin, hair, and sleep quality while fitting a reasonable budget. Our 23mm 6A+ Mulberry Silk Bedding collection brings high-grade mulberry silk directly to your bedroom without the typical luxury markup. A small upgrade can make mornings feel a little smoother.
These sources are included to support the article's material, textile, safety, standards, or claim-verification context.
What Momme Is Best for Silk Sheets? The 23-Momme Sweet Spot
Not every momme weight is right for bed sheets. Why 23-momme 6A+ mulberry silk offers the best balance of smoothness, durability, and value—and how to choose your first Promeed set.
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