How to Evaluate Silk Pillowcase Quality
The silk pillowcase market has grown significantly, bringing both legitimate premium products and misleading marketing claims. Understanding the key quality indicators helps you make an informed purchase decision rather than relying on brand messaging alone.
Silk Grading: A Through 6A
Raw silk is graded on a scale from A (lowest) to 6A (highest). Grade reflects fiber length, uniformity, and purity. Grade 6A silk comes from the center of the cocoon where fibers are longest and most consistent. Lower grades use shorter fibers, may contain more sericin residue, and produce rougher fabric. Many brands do not disclose their silk grade - a significant red flag. POSHEY exclusively uses Grade 6A long-fiber mulberry silk.
Momme Weight: The Density Standard
Momme measures silk density - the weight in pounds of a piece of silk 45 inches by 100 yards. For pillowcases, the quality spectrum is clear: 16-19 momme is entry-level and wears thin quickly, 22 momme is the premium standard offering optimal balance of smoothness, breathability, and durability, and 25+ momme is heavier with diminishing returns for sleep use. POSHEY uses 22-momme, which lab-tests for significantly better durability than 19-momme while maintaining the breathability that 25-momme sacrifices.
Certification: Third-Party Verification
Claims like hypoallergenic, chemical-free, and safe for skin are meaningless without independent verification. Oeko-Tex Standard 100 certification requires testing for over 100 regulated and unregulated substances including formaldehyde, heavy metals, pesticides, and allergenic dyes. This certification costs brands significant money to obtain and maintain, which is why many competitors skip it. Every POSHEY product carries this certification.
What to Watch For
Common marketing tactics to be aware of: listing thread count instead of momme weight (thread count is a cotton metric and irrelevant for silk), using terms like silky or satin-like without specifying 100% silk, claiming charmeuse weave without confirming the base material is silk (charmeuse can be made from polyester), and advertising high momme weights without independent verification.
