{"product_id":"silk-sleep-mask","title":"Silk Sleep Mask | 100% Mulberry Silk","description":"\u003cp\u003eMulberry silk through and through — shell and fill, both sides. Plant-based dyes, Oeko-Tex Standard 100. Every material on the page.\u003c\/p\u003e\n\u003cp\u003eMelatonin suppression begins at 1.3 lux — less than streetlight bleed-through, and closed eyelids don’t block it (Zeitzer et al., 2000). Most ‘silk’ sleep masks are polyester labelled ‘satin’, treated with formaldehyde-resin wrinkle finishes that release with body heat over 8 hours of skin contact. This is 22 momme mulberry silk on both sides, plant-based dyes only, with the silk independently tested to Oeko-Tex Standard 100.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003cdl\u003e\n\u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003e100% mulberry silk — shell, lining and fill\u003c\/dd\u003e\n\u003cdt\u003eShape\u003c\/dt\u003e\n\u003cdd\u003eContoured, total light block\u003c\/dd\u003e\n\u003cdt\u003eStrap\u003c\/dt\u003e\n\u003cdd\u003eElastic\u003c\/dd\u003e\n\u003cdt\u003eDyes\u003c\/dt\u003e\n\u003cdd\u003ePlant-based, GOTS-compatible\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eMaterials\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulberry Silk\u003c\/strong\u003e (~90%) — \u003cem\u003eShell \u0026amp; lining\u003c\/em\u003e\u003cbr\u003eBoth sides are 100% mulberry silk at 22 momme weight — the highest density commonly available. Mulberry silk is a natural protein fibre produced by Bombyx mori silkworms fed exclusively on mulberry leaves, resulting in the longest, smoothest, most uniform silk strands. It has the lowest friction coefficient of any common textile (Kaplan \u0026amp; Okur, 2008), meaning less creasing and irritation against facial skin over 8 hours. Naturally hypoallergenic — silk protein resists dust mites, mould, and bacterial colonisation. Temperature-regulating — breathes and wicks moisture, keeping the skin surface cool in summer and warm in winter, unlike polyester which traps heat and sweat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilk Fill\u003c\/strong\u003e (~8%) — \u003cem\u003ePadding\u003c\/em\u003e\u003cbr\u003e100% mulberry silk padding for the contoured shape — silk through and through, not the cotton or polyester fill most masks hide inside a silk shell. No memory foam, no polyurethane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElastic Strap\u003c\/strong\u003e (~2%) — \u003cem\u003eStrap\u003c\/em\u003e\u003cbr\u003eElastic for a secure fit. Flat design that won’t tangle hair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat we left out\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolyester labelled ‘satin’\u003c\/strong\u003e \u003cem\u003e(Fabric)\u003c\/em\u003e\u003cbr\u003e‘Satin’ is a weave, not a material — the vast majority of ‘silk’ sleep masks sold online are polyester satin. Even masks marketed as ‘100% silk’ often use silk on the outer shell only, with a cotton or polyester inner lining or a cotton\/polyester filling between the layers. This mask is 100% mulberry silk on both sides, 22 momme weight, AND 100% mulberry silk fill inside — no cotton, no polyester, no synthetic filling or lining anywhere. Silk through and through.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSynthetic and azo dyes\u003c\/strong\u003e \u003cem\u003e(Dyes)\u003c\/em\u003e\u003cbr\u003ePlant-based dyes only. Azo dyes can release carcinogenic aromatic amines under skin contact and perspiration — restricted in the EU but common in imports.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMemory foam \/ polyurethane padding\u003c\/strong\u003e \u003cem\u003e(Padding)\u003c\/em\u003e\u003cbr\u003eNo foam. The contoured shape blocks light without putting polyurethane (which off-gasses TDI\/MDI for months) against your face for 8 hours a night.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFormaldehyde wrinkle-free treatments\u003c\/strong\u003e \u003cem\u003e(Processing)\u003c\/em\u003e\u003cbr\u003eLow-grade imported silks often use formaldehyde resins for wrinkle resistance — releases formaldehyde with body heat and perspiration. GOTS-compatible processing only.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlastic nose bridge \/ elastic\u003c\/strong\u003e \u003cem\u003e(Hardware)\u003c\/em\u003e\u003cbr\u003eNo plastic nose-bridge insert and no plasticized elastic. Natural rubber elastic in a cotton sleeve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVelcro closures\u003c\/strong\u003e \u003cem\u003e(Fastening)\u003c\/em\u003e\u003cbr\u003eVelcro catches and damages silk. Elastic strap — simpler, quieter, won’t tangle hair.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGel eye inserts\u003c\/strong\u003e \u003cem\u003e(Padding)\u003c\/em\u003e\u003cbr\u003eSome masks add gel inserts for ‘cooling’. These are PVC or silicone filled with glycerine — adding weight, synthetic materials against your skin, and a component that eventually leaks. The contoured silk shape blocks light without any of that.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy we built it this way\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e100% mulberry silk on both sides — not polyester labelled ‘satin’ (satin is a weave, not a material)\u003c\/li\u003e\n\u003cli\u003eSilk fill, not cotton or polyester — the padding inside is 100% mulberry silk too. Most ‘silk’ masks (even ones sold as ‘100% silk’) use a silk shell over a cotton or polyester fill. This one is silk through and through.\u003c\/li\u003e\n\u003cli\u003e22 momme weight — the highest density commonly available. Thicker silk = more durable, softer, better light block\u003c\/li\u003e\n\u003cli\u003eTotal light block — contoured shape with no gaps at nose or temples. No light leaks around edges\u003c\/li\u003e\n\u003cli\u003eHypoallergenic — silk protein naturally resists dust mites, mould, and bacterial growth\u003c\/li\u003e\n\u003cli\u003eTemperature-regulating — silk breathes and wicks moisture, stays cool in summer, warm in winter\u003c\/li\u003e\n\u003cli\u003eLess friction on skin than cotton or polyester — silk’s smooth protein surface reduces creasing and irritation\u003c\/li\u003e\n\u003cli\u003eElastic strap — fits all head sizes without pressure points\u003c\/li\u003e\n\u003cli\u003ePlant-based dyes only — no synthetic colourants, no azo dyes, no heavy metal pigments\u003c\/li\u003e\n\u003cli\u003eNo memory foam padding — contoured shape blocks light without putting polyurethane against your skin\u003c\/li\u003e\n\u003cli\u003eHand wash only — silk is a natural protein fibre that degrades in machine wash. This is by design, not a limitation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to use\u003c\/h2\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition the mask\u003c\/strong\u003e\u003cbr\u003ePull the strap until it sits comfortably without pressing on your temples. Snug, not tight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition the contoured cups over your eyes\u003c\/strong\u003e\u003cbr\u003eThe raised sections should sit in your eye sockets. This is what blocks light at the nose and temples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSleep\u003c\/strong\u003e\u003cbr\u003eThe mask stays put. If you’re a side sleeper, the flat profile won’t dig in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand wash weekly\u003c\/strong\u003e\u003cbr\u003eCool water, mild detergent, press dry between towels. Don’t wring silk — it weakens the fibres.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\u003ch3\u003eWhat is the best sleep mask?\u003c\/h3\u003e\u003cp\u003eThe material against your face matters most. Most masks sold as ‘silk’ or ‘satin’ are polyester — a petroleum-derived fabric that traps heat, doesn’t breathe, and sheds microplastics against your skin for 8 hours a night. This mask is 100% mulberry silk on both sides at 22 momme weight — the highest density commonly available. It blocks light completely, regulates temperature naturally, and the surface against your face is protein, not petroleum.\u003c\/p\u003e\u003ch3\u003eDo sleep masks actually help you sleep?\u003c\/h3\u003e\u003cp\u003eYes. Even dim light during sleep suppresses melatonin and disrupts slow-wave sleep stages (Cho et al., 2016). Melatonin suppression begins at just 1.3 lux — far below a streetlight through curtains (Zeitzer et al., 2000). Total darkness is required for unrestricted melatonin synthesis. A properly fitting mask that blocks all light achieves this without blackout curtains.\u003c\/p\u003e\u003ch3\u003eIs there a difference between silk and satin sleep masks?\u003c\/h3\u003e\u003cp\u003eYes — and it’s the single biggest thing to check before buying. Satin is a weave, not a material. Most masks sold as ‘silk satin’ or just ‘satin’ are polyester in a satin weave. The feel is similar at first touch, but polyester doesn’t breathe, doesn’t regulate temperature, sheds microplastics, and traps sweat against your skin for 8 hours a night. Real mulberry silk is a natural protein fibre — hypoallergenic, temperature-regulating. This mask is 100% mulberry silk on both sides.\u003c\/p\u003e\u003ch3\u003eWhat does momme weight mean?\u003c\/h3\u003e\u003cp\u003eMomme is the unit used to measure silk density. Higher momme = thicker, more durable, softer silk. Most silk products are 12–16 momme. This mask is 22 momme — the highest commonly available. The difference is noticeable in durability, light blocking, and how the silk feels against skin.\u003c\/p\u003e\u003ch3\u003eIs it actually silk on both sides?\u003c\/h3\u003e\u003cp\u003eYes — and so is the fill. Both the outer shell and the inner lining that touches your face are 100% mulberry silk, and the padding between them is 100% mulberry silk too: silk through and through. Many competitors use polyester on one side and silk on the other, or polyester on both sides marketed as ‘satin’ — and even most masks sold as ‘100% silk’ mean the shell only, with a cheaper cotton or polyester fill hidden inside. This one has no cotton and nothing synthetic anywhere.\u003c\/p\u003e\u003ch3\u003eWill it slip off during sleep?\u003c\/h3\u003e\u003cp\u003eThe elastic strap holds it in place. The contoured shape sits in your eye sockets rather than pressing flat, so it stays put even for side sleepers.\u003c\/p\u003e\u003ch3\u003eHow do I wash it?\u003c\/h3\u003e\u003cp\u003eHand wash in cool water with mild detergent. Don’t wring — press gently between towels. Air dry flat. Machine washing degrades silk protein fibres.\u003c\/p\u003e\u003ch3\u003eCan I wear it with eyelash extensions?\u003c\/h3\u003e\u003cp\u003eYes. The contoured shape creates a dome over your eyes rather than pressing flat against lashes. No contact with the eye area.\u003c\/p\u003e\u003ch3\u003eHow do I get the best light block from it?\u003c\/h3\u003e\u003cp\u003ePosition the mask so the contoured cups sit inside your eye sockets — not pressed flat across the bridge of your nose. The dome shape is what blocks light at the temples and nose; a flat-sitting mask leaves gaps in those exact places. Side sleepers: the low profile means it won’t dig in against the pillow. If light still leaks at the bridge, the mask is sitting too high — shift it down so the lower edge sits flush against your cheekbones.\u003c\/p\u003e\u003ch3\u003eWhat about the synthetic ‘silk’ mask I already have?\u003c\/h3\u003e\u003cp\u003ePolyester sheds microplastic fibres against your skin under friction (Napper \u0026amp; Thompson, 2016) and traps body heat and sweat — your face perspires for 8 hours, and synthetic fabric doesn’t wick. The dye and any wrinkle-resin finish keep migrating as long as you keep wearing it. There’s no way to ‘rinse out’ a finishing chemistry that’s bonded to the fibre. The fastest fix is to replace the contact-side fabric. The slower fix is to keep using it and accept the trade-off.\u003c\/p\u003e\n\u003ch2\u003eResearch\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCho CH, Lee HJ, Yoon HK, Kang SG, Bok KN, Jung KY, Kim L, Lee EI\u003c\/strong\u003e (2016). \u003cem\u003eChronobiology International\u003c\/em\u003e\u003cbr\u003eExposure to dim light during sleep (~40 lux, equivalent to a bedroom with streetlight bleed-through) impairs glucose metabolism and insulin sensitivity the next day. Closed eyelids do not fully block light exposure. Total darkness during sleep is required for optimal metabolic recovery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZeitzer JM, Dijk DJ, Kronauer RE, Brown EN, Czeisler CA\u003c\/strong\u003e (2000). \u003cem\u003eJournal of Physiology\u003c\/em\u003e\u003cbr\u003eMelatonin suppression in humans begins at just 1.3 lux — far below normal indoor lighting. Full darkness is required for unrestricted melatonin synthesis, which drives restorative sleep architecture. Any ambient light during sleep partially suppresses melatonin, reducing sleep quality measurably.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHatori M, Panda S\u003c\/strong\u003e (2010). \u003cem\u003eTrends in Molecular Medicine\u003c\/em\u003e\u003cbr\u003eArtificial light at night disrupts the master circadian clock in the suprachiasmatic nucleus, with downstream effects on metabolism, hormone regulation, and sleep architecture. Chronic exposure to light during biological night is associated with increased risk of metabolic and mood disorders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eObradovich N, Migliorini R, Mednick SC, Fowler JH\u003c\/strong\u003e (2017). \u003cem\u003eScience Advances\u003c\/em\u003e\u003cbr\u003eSleep quality is directly linked to ambient environmental conditions including light and temperature. Temperature dysregulation during sleep reduces time spent in restorative stages. Silk’s thermoregulatory properties — wicking moisture and maintaining skin surface temperature — address the thermal dimension of sleep quality that synthetic fabrics disrupt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKaplan S, Okur A\u003c\/strong\u003e (2008). \u003cem\u003eFibres and Textiles in Eastern Europe\u003c\/em\u003e\u003cbr\u003eMulberry silk has a lower coefficient of friction than any common textile fibre including cotton, polyester, and nylon. The smooth protein surface reduces mechanical irritation on skin contact. For a fabric pressed against facial skin for 8 hours nightly, friction coefficient directly determines whether the material causes creasing, irritation, and moisture trapping.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEso World\u003c\/strong\u003e publishes every material in every product. The full materials list, exclusion list, and citations live on the product page.\u003c\/p\u003e","brand":"Eso World","offers":[{"title":"Pale Blue","offer_id":54111652938068,"sku":"FP-SLP_MSK-PALE-BLUE","price":24.99,"currency_code":"GBP","in_stock":true},{"title":"White","offer_id":54111652970836,"sku":"FP-SLP_MSK_WHT","price":24.99,"currency_code":"GBP","in_stock":true},{"title":"Brown","offer_id":55789291012436,"sku":"FP-SLP_MSK-BROWN","price":24.99,"currency_code":"GBP","in_stock":true},{"title":"Sage","offer_id":55789291045204,"sku":"FP_SLP_MSK_SAGE","price":24.99,"currency_code":"GBP","in_stock":true},{"title":"Pink","offer_id":55789291077972,"sku":"FP-SLP_MSK-PINK","price":24.99,"currency_code":"GBP","in_stock":true},{"title":"Cream","offer_id":55789291110740,"sku":"FP-SLP_MSK-CREAM","price":24.99,"currency_code":"GBP","in_stock":true},{"title":"Dark Teal","offer_id":55789291143508,"sku":"FP-SLP_MSK-DARK-TEAL","price":24.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1024\/5655\/7908\/files\/group-staircase-grass-7523_386d372c-1368-4abb-ada4-4fd19195dce3.png?v=1778654735","url":"https:\/\/esoworld.myshopify.com\/products\/silk-sleep-mask","provider":"Eso World","version":"1.0","type":"link"}