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Silk momme - As silk fibres are much thinner in diameter than cotton, momme is used instead of thread count. Momme describes silk’s weight and density. The higher the momm, the more strands of silk per 100 yards of fabric, which means that the silk will be higher quality and more durable. Momme measurements range from 11-momme to 25-momme, with 22-Momme the ideal measurement for the best quality silk bedding or clothing.

And when was the duvet invented?