Silk Education & Buying Guides

Momme (mm) measures silk weight, roughly equivalent to thread count in cotton. 22 momme is the quality benchmark most serious brands aim for — substantial, smooth, and durable enough for daily use. It is the right starting point and covers most people well. 30 momme is the meaningful step up: noticeably heavier in hand, more opaque, and significantly more durable because there is simply more silk in every square metre of fabric. It retains its smoothness longer under repeated washing and tends to hold its lustre over years rather than months. The trade-off is cost, not quality. If you want the pillowcase to last and you wash it regularly, 30 momme is the one you buy once. Anything below 19 momme at a premium price is worth being sceptical of.

Silk is graded A through C based on the uniformity, length, and lustre of the raw filaments. Grade A is the highest tier; Grade 6A is the top classification within that tier, indicating the longest, most uniform, and most consistently lustrous threads available. In practice, Grade 6A means fewer joins in the weave, a smoother surface, and a fabric that holds its quality longer. It is not a regulated standard with a single certifying body, which is why it appears frequently in marketing. The honest signal is whether the brand can name its supplier and show independent test results alongside the grade claim. Grade alone, without traceability, is marketing shorthand.

Mulberry silk comes from Bombyx mori silkworms fed exclusively on mulberry leaves in controlled conditions. The result is a long, uniform, naturally white filament that weaves into the smooth, lustrous fabric most people picture when they think of silk. Other silk types include Tussah (wild silk, coarser and naturally tan), Eri (shorter fibres, more matte), and Muga (rare, from Assam, with a golden sheen). For bedding and beauty purposes, mulberry silk is the standard because its uniform filament produces the smoothest surface. Wild and short-fibre silks have their applications, but a pillow weave from them will not feel the same.

A few practical tests help. Real silk chars rather than melts when exposed to a flame, smells like burning hair, and leaves a crushable ash. Polyester satin melts into a bead, smells chemical, and leaves a hard residue. On texture alone, real silk warms quickly to body temperature; polyester stays cool longer and feels slightly slick rather than smooth. A ring test can help too: genuine charmeuse weave should pass through a ring fairly easily. The most reliable method, though, is buying from a brand that publishes third-party lab test results and names its mill. No lab results and a suspiciously low price is usually the answer before the burn test is needed.

Yes, and specifically for something you sleep on for eight hours a night. OEKO-TEX Standard 100 is an independent certification that tests the finished fabric for harmful substances including pesticide residues, heavy metals, formaldehyde, and pH imbalance. It is not a sustainability certification (that is a separate OEKO-TEX category) but it is a meaningful health and safety one. For silk specifically, the sericulture and dyeing process can involve chemicals that remain in the finished fabric without treatment. A brand that has pursued OEKO-TEX certification has had its product independently tested and cleared. One that avoids mentioning it when asked is worth asking again.

Charmeuse is a satin-weave structure where more of the warp threads appear on the surface, creating a smooth, slightly lustrous face and a more matte reverse side. For a pillowcase, it matters because the smooth, continuous surface is what makes silk effective at reducing friction. The alternative is a plain or twill weave, which is more durable but has more texture. A silk pillowcase that is not charmeuse-woven will still be smoother than cotton, but it will not offer the same glide. The majority of quality silk pillowcases are charmeuse-woven for exactly this reason. If a listing does not specify the weave, it is worth asking before buying.

Start with the pillowcase. The reasoning is straightforward: a silk pillowcase delivers the benefits most people are actually after (reduced friction on face and hair, overnight moisture retention, cooler surface temperature) at a fraction of the cost and commitment of a full sheet set. It also lets you assess whether you genuinely notice a difference before investing in bedding that costs considerably more. A full set of silk sheets is a worthwhile upgrade for those who run hot or who want the benefits across the whole body, but it is a second step, not a starting point. One quality pillowcase will tell you more than any amount of reading about whether silk is worth it for you personally.

Whether the brand can tell you what is actually in the product. Specifically: the momme weight, the silk grade, the weave type, whether it is OEKO-TEX certified, and ideally the name of the mill it comes from. A brand that can answer all five has nothing to hide. The silk pillowcase market has a significant counterfeiting and mislabelling problem, with polyester satin sold under "silk" branding and low-grade fabric passed off as 6A mulberry. Price is a proxy but not a guarantee. The honest shortcut is: if the product page cannot tell you the momme weight and certification without you emailing to ask, assume the answer is not one they want to give you.