Is satin always fake silk?

Not technically — satin can be woven from silk fibers too, and that combination exists. But in mainstream retail, the vast majority of affordable "satin" pillowcases are polyester or nylon, not silk, so the label alone won't tell you which one you're getting.

How can I tell real silk from synthetic satin?

Check the fiber content on the label first — it should say "100% mulberry silk," not just "satin." Real silk also feels cool to the touch and warms slightly against skin, while synthetic satin tends to feel slippery-cold and stays that way.

Satin vs Silk

Satin Pillowcase vs Silk Pillowcase: The Difference Nobody Explains at Checkout

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Satin Is a Weave, Not a Material — and That Changes Everything

"Satin" describes how threads are woven, not what they're made of. Most satin pillowcases sold at low prices are polyester or nylon woven in a satin pattern — a synthetic fabric that looks glossy but doesn't behave like silk at all. It traps heat, can build up static, and isn't breathable the way a natural fiber is.

Real Silk Is a Natural Fiber With Its Own Properties, Regardless of Weave

Mulberry silk is a natural protein fiber that's breathable, temperature-regulating, and naturally hypoallergenic — properties that come from what it's made of, not just how it's woven. That's why a genuine silk pillowcase behaves differently from a synthetic satin one even when they look similar on a shelf.

      "If a "silk" pillowcase costs less than a decent dinner out, check the label — it's very likely polyester satin wearing silk's reputation.
      "
    

Property	Synthetic Satin (Poly/Nylon)	Pure Mulberry Silk
Breathability	Low, traps heat	High, temperature-regulating
Static Build-Up	Common	Rare
Hypoallergenic	No	Naturally, yes

Silkhouse pure mulberry silk pillowcase compared to synthetic satin

Read the Fiber Content, Not Just the Word "Satin"

The word "satin" on a label tells you nothing about breathability, hypoallergenic properties, or how it will feel by hour six of sleep. Silkhouse's pillowcases are 100% mulberry silk, Oeko-Tex certified — the material itself, not just a shiny weave.