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Denier is a unit of weight used to measure the thickness of silk or artificial fibres commonly used for stocking. It refers to the weight in grams of 9 000 meters of yarn, so a 30 denier yarn weighs 30 grams at a length of 9 000 meters. The lower the denier, the thinner the tights.
Sources
Wikipedia – Denier, a unit of linear mass density of fibers 
Wikipedia – What does fabric Denier mean
May 2023, TÄNKOM | Revised March 2024 RETHINK
