> Editorial Note: I’m Heather Adams, and I cover sofas, tables, mattresses, and bedding. The picks here are evaluated on the materials layer — foam density, coil gauge, frame construction, and fiber content — against CertiPUR-US, OEKO-TEX, and BIFMA standards.
Slip built its name on one number: 22 momme. That’s the weight-per-yard spec that separates a genuine mulberry silk case from thin 12-momme knockoffs. If you’re already deep in bedding upgrades, pair this research with our silk pillowcase overview, our notes on a silk pillowcase for hair, the warmth guide to silk comforters, the skin-focused pillowcase for acne breakdown, and the fabric debate in satin vs silk sheets. Five Slip cases below, differentiated by size and color.
How We Evaluated
We ranked each case on momme weight, OEKO-TEX certification, closure type, and owner durability reports across 100-plus wash cycles. All five share the same 22 momme Grade 6A mulberry construction, so color, size, and price-per-use drove the ordering. Sleep Foundation flags 22 momme as the friction sweet spot for hair and skin.
1. Slip Silk Queen Pillowcase, White — the neutral that hides nothing and wins anyway
This one wins. The White Queen is Slip’s flagship in the most-bought size, and the 22 momme surface reduces friction that tugs at hair strands overnight. OEKO-TEX Standard 100 certification means no harmful residues against your skin, a spec Apartment Therapy calls table stakes for silk. The envelope closure keeps the case flat, no lumpy zipper. White shows wash-wear fastest, so it’s an honest durability gauge. Owners report the color holding through 50-plus gentle cycles. Machine washable on delicate, which most 6A silk can’t survive.
2. slip King Pure Silk Pillow Case — for larger pillows and combination sleepers
The King runs roughly 20 by 36 inches, sized for oversized or body-adjacent pillows that a Queen leaves gapping. Same 22 momme mulberry, same anti-bedhead surface, just more coverage for people who shift positions all night. The envelope back holds a King insert without the pillow creeping out. Combination sleepers who rotate between back and side benefit from the extra fabric that stays put. If your bed runs California King or you use a European square insert, this is the size that actually fits. Slightly higher price for the added material.
3. Slip Silk Queen Pillowcase, Seabreeze — the cool-tone pick that resists visible fading
Seabreeze is Slip’s muted blue-green, and cooler dye tones tend to mask minor wash-fade better than pure white. Same 22 momme Grade 6A silk, same OEKO-TEX certification, same envelope closure. The color reads calm against gray or navy bedding without shouting. Silk’s natural temperature regulation keeps the surface cooler than cotton by a few degrees, useful for hot sleepers. Owners note the Seabreeze dye stayed true across dozens of delicate washes. A solid choice if plain white feels clinical to you. Same care rules apply.
4. Slip Silk Queen Pillowcase, Pink — the skin-first color for gentler routines
Pink is the case people pair with skincare goals. Silk absorbs less moisture than cotton, so it may help keep night creams on your face instead of wicking them away. That’s a hedge, not a cure, but the 22 momme surface also creates less crease-pressure on skin overnight. Same OEKO-TEX Standard 100 backing, same envelope construction. The soft rose tone hides light residue from serums better than white does. Owners with sensitive skin favor this one. Wash cold, hang or lay flat to dry.
5. Slip Silk Queen Pillowcase, Silver — the versatile metallic that matches any palette
Silver is the chameleon. The cool gray sheen reads neutral against warm and cool bedding alike, so it’s the safest pick if you redecorate often. Identical 22 momme mulberry silk, identical certifications, identical anti-bedhead performance. The subtle luster catches light without looking flashy. Silver hides everyday wear about as well as Seabreeze, better than white. If you want one case that works through multiple duvet swaps, this is it. Same delicate-cycle care keeps the finish intact.
Comparison Table
| Pick | Size | Color | Momme | Closure |
|---|---|---|---|---|
| White Queen | Queen | White | 22 | Envelope |
| King | King | White | 22 | Envelope |
| Seabreeze Queen | Queen | Seabreeze | 22 | Envelope |
| Pink Queen | Queen | Pink | 22 | Envelope |
| Silver Queen | Queen | Silver | 22 | Envelope |
What to Check Before You Buy
Momme weight is the number that matters. Below 19 momme, silk feels flimsy and frays fast. All five Slip cases hit 22, the friction sweet spot Sleep Foundation cites. Confirm OEKO-TEX Standard 100 certification, which verifies no harmful dyes touch your skin. Grade 6A refers to the longest, most uniform fibers, the strongest tier of mulberry silk. Closure matters too. Envelope backs sit flatter than zippers and won’t snag hair. Finally, match the case to your pillow. A Queen case on a King insert gaps and slides.
Color vs. Size: Which Decision Comes First
Size is non-negotiable, color is preference. Measure your pillow before anything else. A standard or Queen insert runs about 20 by 30 inches, a King insert 20 by 36. Slip’s Queen cases fit standard and Queen pillows. The King fits King inserts only. Once size is locked, color comes down to upkeep. White exposes wash-wear fastest, silver and Seabreeze hide it best, pink splits the difference while pairing with skincare routines. Every color shares the same 22 momme silk, so performance is identical across the palette.
Frequently Asked Questions
What does 22 momme mean?
Momme measures silk weight per fixed area. Higher momme means denser, more durable fabric. At 22 momme, Slip’s cases hit the range Sleep Foundation identifies as ideal, dense enough to last through 100-plus washes yet soft enough for nightly friction reduction on hair and skin.
Can I machine wash a Slip silk pillowcase?
Yes, on a cold delicate cycle inside a mesh bag. Use a pH-neutral silk detergent, skip fabric softener, and lay flat or hang to dry. Grade 6A mulberry silk tolerates careful washing better than cheaper grades, which shred in standard cycles.
Does silk really help with hair and skin?
It may help. The low-friction surface reduces tugging that causes breakage and creates less overnight crease-pressure on skin. Silk also wicks less moisture than cotton, so night creams stay put. These are surface-level advantages, not medical treatments.
Which color should I choose?
Function is identical across colors. Pick by upkeep. White shows wash-wear soonest, silver and Seabreeze mask it best, pink hides serum residue while matching skincare routines. All five use the same 22 momme Grade 6A silk and OEKO-TEX certification.
Is the King case worth the higher price?
Only if you own King inserts or European square pillows. A Queen case on a King pillow gaps and slides off. The King’s extra fabric, roughly 20 by 36 inches, justifies the cost for combination sleepers who shift positions overnight.
How is silk different from satin?
Silk is a natural fiber, satin is a weave that can use polyester. Silk breathes and regulates temperature better. Our satin vs silk sheets guide breaks down the trade-offs. Slip uses genuine 22 momme mulberry silk, not a satin substitute.
Bottom Line
The White Queen wins for most sleepers. It’s Slip’s flagship in the most-bought size, hits 22 momme, carries OEKO-TEX certification, and its plain finish makes wash-wear easy to catch early. Choose the King only if you own King or European inserts, since a Queen case gaps on larger pillows. Every color shares identical silk, so color is pure preference. White’s fade-honesty is the one real trade-off.
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