Silk pillowcases vary significantly in quality, construction, and performance due to differences in silk type, weave, thread count, and manufacturing standards. Not all silk pillowcases deliver the same benefits or durability. The main silk varieties used are mulberry silk (highest quality, smooth and durable), tussah silk (coarser and less lustrous), and bombyx silk (the standard in high-end pillowcases). Weave type matters too—charmeuse weave creates a smooth surface ideal for reducing friction on hair and skin, while satin weave may feel different and have varying slip properties. Thread count varies widely, with higher counts typically indicating denser, softer fabric, though marketing claims can be misleading. The quality of manufacturing affects how well the pillowcase holds its shape, how quickly it degrades, and whether seams are reinforced. Some pillowcases use multiple layers or bonded construction for added durability. Price differences often reflect these factors—premium pillowcases from reputable manufacturers use pure mulberry silk with careful construction, while cheaper versions may use lower-grade silk blends or contain synthetic fibers. The closure method also differs: some use envelope closures, others use zippers, each offering different convenience and durability. Certification standards like Momme weight (measuring silk thickness) can help compare quality, though not all sellers use this metric. If you're seeking specific benefits like improved hair health or skin care, the pillowcase quality and proper silk type matter significantly—a low-quality silk pillowcase may provide minimal advantage over cotton.