Mulberry silk and tussah silk are both real silk, but they are not the same material story. If you are buying a silk duvet, the difference matters, but it should not be the only detail you check. A duvet is built from several parts: the silk filling, the outer shell, the fill weight, the construction, the cover you use over it, and the care instructions.
That is why a clear silk duvet listing should explain more than the phrase "100% silk." It should help you understand what kind of silk is inside the duvet and how the duvet is built.
What is mulberry silk?
Mulberry silk usually refers to silk from the domesticated Bombyx mori silkworm, which feeds on mulberry leaves. It is the largest commercial silk category and is the type most people think of when they hear "silk" in bedding, pillowcases, sleep masks, and many silk-filled duvets.
In bedding, mulberry silk is often chosen because it can be fine, smooth, and relatively uniform. For a duvet insert, that does not mean you will feel the silk directly against your skin, because the filling sits inside a shell. But it can still matter for the quality and consistency of the filling.
What is tussah silk?
Tussah silk, also spelled tasar or tussar in some textile contexts, belongs to the non-mulberry or wild silk category. It is commonly associated with wild silkworms from the Antheraea genus. Compared with mulberry silk, tasar/tussah silk is often described as more textured, more copper or golden in natural colour, coarser, and less lustrous.
That does not make tussah silk "bad." It can be beautiful in fabrics and decorative textiles. The practical question for a duvet is different: if the silk is hidden inside a shell, how much does the silk type affect the finished bedding experience compared with fill weight, shell fabric, and construction?
Does the silk type matter in a duvet?
Yes, but it is one factor, not the whole decision. The silk type tells you something about the source and character of the filling. Mulberry silk is usually the clearer premium signal in silk bedding because it is widely used and more commonly associated with fine, uniform silk. Tussah silk may appear in lower-cost or more textured silk products, depending on the construction and grade.
For a duvet, the buyer should also ask: how much silk filling is inside, what the shell is made from, whether the duvet has corner loops, how it should be cared for, and whether the duvet is meant to feel fluffy, drapey, light, or warm.
Why fill weight may matter more than the word "silk"
Fill weight tells you how much filling is inside the duvet. Two duvets can both say "silk," but if one has much more fill than the other, they may feel very different. A lighter silk duvet may suit warmer rooms or people who dislike bulky bedding. A heavier silk duvet may suit cooler rooms or people who want more warmth.
This is why Little Cocoon publishes fill weights for its adult all-season silk duvet sizes. For example, the adult all-season family lists 500 g silk filling for Twin, 750 g for Queen, and 900 g for King. Those numbers help shoppers compare the actual duvet, not just the material name.
Why the shell fabric still matters
The shell, sometimes called the casing, holds the silk filling in place. Even if you use a duvet cover, the shell can affect drape, durability, breathability, and sound. A stiff or noisy shell may change how the duvet feels, even when the filling is good.
For shoppers, the best question is not only "Is this mulberry silk?" It is also: what is the shell fabric, how is the fill secured, and does the product page clearly disclose the details?
Mulberry silk vs tussah silk: quick comparison
| Question | Mulberry silk | Tussah / tasar silk |
|---|---|---|
| Common source | Bombyx mori silkworms fed on mulberry leaves | Non-mulberry/wild silk category, often from Antheraea silkworms |
| Typical textile character | Often finer, smoother, more uniform | Often more textured, coarser, more naturally golden or copper-toned |
| Common bedding signal | Commonly used as a premium silk-bedding term | Less common in mainstream silk duvet marketing, but still a real silk category |
| For duvet buyers | Useful quality signal, especially when paired with clear fill weight and construction details | Worth asking about grade, fill weight, construction, and price positioning |
What should you check before buying a silk duvet?
- Silk type: mulberry silk, tussah/tasar silk, or an unspecified silk blend.
- Fill weight: the actual weight of the silk filling, not only the total product weight.
- Shell fabric: cotton, silk, Tencel/lyocell, polyester, or another casing material.
- Construction: how the fill is held in place and whether the duvet has corner loops or ties.
- Care: whether it needs a duvet cover, spot cleaning, airing, or professional care.
- Feel expectation: silk duvets usually feel more drapey and less lofty than down.
A Little Cocoon note
At Little Cocoon, we focus on mulberry silk duvet fill, disclosed fill weights, and practical bedding fit. A silk duvet is not automatically right for everyone. It may suit someone who wants a lighter, more draping duvet feel and clear material specifications. It may not suit someone who wants a very puffy down-like look, machine-washable bedding, or a duvet for a very cold unheated room.
If you are comparing silk duvets, start with our guide to what actually matters in a silk duvet, or view the Little Cocoon all-season mulberry silk duvet.
Frequently asked questions
Is mulberry silk better than tussah silk for a duvet?
Mulberry silk is usually the clearer premium signal for silk bedding because it is widely used and often more uniform. But a duvet should not be judged by silk type alone. Fill weight, shell fabric, construction, care instructions, and size also matter.
Is tussah silk real silk?
Yes. Tussah, tasar, or tussar silk belongs to the non-mulberry or wild silk category. It is real silk, but it has a different source and textile character from mulberry silk.
Can I feel the difference between mulberry silk and tussah silk inside a duvet?
Not directly in the same way you would feel a pillowcase or sheet, because the silk filling is inside the shell and usually inside a duvet cover. You may notice the finished duvet's weight, drape, warmth, sound, and softness more than the raw fibre itself.
What matters most in a silk duvet?
Look for the silk type, fill weight, shell fabric, dimensions, construction details, care instructions, and whether the duvet is designed for the season and room temperature you need.
What does Little Cocoon use?
Little Cocoon's adult all-season silk duvet is positioned around mulberry silk filling with published fill weights by size. Always check the product page for the current size, care, and availability details before buying.
Sources and evidence notes
General silk-type information is based on public material from the International Sericultural Commission and the Central Silk Board. Product-specific Little Cocoon details should be checked on the current product page before purchase.