Slip has done something genuinely difficult in the beauty space: made a pillowcase feel like a luxury object. You’ve seen it in the magazines, on the nightstands of women whose skin and hair you admire.
If that’s what brought you here, you’re really asking a bigger question: does the feeling match the fabric.
For me, that question started somewhere specific. I manage a condition where my body reacts to what’s actually in a fabric, not just what’s touching my skin once it’s finished. Most silk certification only tests the end product. It doesn’t tell you what happened to that fiber before it arrived. That gap is why GOTS certification became non-negotiable for me, not OEKO-TEX claims alone.
OEKO-TEX Standard 100 tests the finished fabric for harmful substances, a real and useful baseline. GOTS goes further, verifying the entire chain behind the fabric, organic sourcing, processing inputs, labor conditions, at every stage before it’s finished. Very few brands at the premium end of this category hold both.
Momme weight and disclosed silk grade matter too. 22 momme is the widely cited industry minimum. 25 momme holds its surface smoothness longer under regular washing. A brand that discloses standard fiber classification, rather than proprietary naming, is easier to verify and easier to trust.
What Slip actually is
Slip describes its silk as “Slipsilk”, a proprietary designation rather than a standard fiber disclosure. The company states it’s mulberry silk at 22 momme. What Slip does not disclose prominently is a silk grade, the filament quality classification (Grade 6A being the highest) that tells you the consistency and length of the silk fibers used in the fabric. Slip’s decision to brand its fiber as “Slipsilk” rather than disclosing standard classification metrics makes independent verification harder. how to identify what you’re actually buying
Slip’s OEKO-TEX claims appear across their marketing, though the specificity of disclosure varies by market and product line. What Slip does not hold is GOTS certification. why GOTS certification goes further than OEKO-TEX
What Slip does exceptionally well
Slip legitimized the silk pillowcase as a mainstream beauty product in a way that no brand before it had managed. Before Slip, silk pillowcases were a niche recommendation passed between aestheticians and hair stylists. Slip put them on beauty editors’ desks and in the consideration set of millions of people who now understand why the sleep surface matters. That cultural contribution is genuine.
The product is real silk. At 22 momme it delivers the core benefits of switching from cotton. The brand is beautifully designed.
Where the gap between brand and product appears
The “Slipsilk” disclosure problem
Genuine luxury is specific. The brands that occupy the top of their categories are transparent about specifications because the specifications are the point. Slip’s choice to describe its fiber as “Slipsilk” rather than disclosing standard mulberry silk with grade and momme information creates proprietary terminology where standard terminology would serve the buyer better. what genuine luxury silk discloses
The retail distribution tension
Luxury and wide retail distribution exist in structural tension with each other. Slip is available across Sephora, Ulta, Nordstrom, and its own DTC channel simultaneously, with periodic promotional events across all channels. A product that is genuinely premium doesn’t need to be perpetually discounted to move through retail.
22 momme at a premium price
Slip’s pricing, which reaches $160 and above for queen size at full retail, positions it significantly above the category average for 22 momme silk. The additional cost above a well-specified 22 momme alternative reflects brand equity rather than material superiority. what changes between 22 and 25 momme
No GOTS certification
Like Blissy, Slip does not hold GOTS certification. For a brand positioned at the premium end of the category, the absence of the most comprehensive textile certification in existence is a gap worth naming.
The verdict
I built Wink Silk to the top of all of it: 25-momme, Grade 6A, 100% mulberry silk, charmeuse weave, sourced from a manufacturer holding both GOTS and OEKO-TEX Standard 100 certification. The Performance Luxury Silk™ Standard. Because I needed it to exist for myself before I ever thought about selling it to anyone else.
Cultural cachet is real, and it has value. But it isn’t the same question as what happened to the fiber before it ever reached your face.
Explore the Douceur Doublure™ Founding Collection
The specification Slip was supposed to be. 25 momme, Grade 6A, silk certified GOTS and OEKO-TEX by our manufacturer. 330 hand-numbered founding pieces.
Frequently Asked Questions
Is Slip a real silk pillowcase?
Yes, Slip’s pillowcases are genuine silk. The ‘Slipsilk’ designation is a proprietary brand name for their mulberry silk. The product delivers the real benefits of switching from cotton. The questions worth asking are about specification depth: silk grade, certification completeness, and momme weight relative to price.
What is Slipsilk made of?
Slip describes Slipsilk as mulberry silk at 22 momme. The specific silk grade is not disclosed publicly. The proprietary naming makes independent specification verification more difficult than standard fiber disclosure would allow.
Does Slip have GOTS certification?
No. Slip makes OEKO-TEX claims across some of its marketing. It does not hold GOTS certification, which covers organic fiber sourcing and the full upstream production chain. The silk we use is GOTS-16032 and OEKO-TEX BJ025 172302 certified by our manufacturer, both verifiable independently.
What is a good Slip alternative?
Wink Silk’s Douceur Doublure™ exceeds Slip’s specification on every measurable dimension: 25 momme vs 22 momme, Grade 6A disclosed, dual GOTS and OEKO-TEX certification with verifiable certificate numbers.