What is the specific meaning of "120S" in hotel linen?

120S refers to the yarn count of flax. Specifically, it means that the yarn weight is 1 pound at a given moisture regain. Its length is several 840 yards, called several yarns. According to the national standard, 80S should be used for bedding in five-star hotels, and 120S is a relatively high yarn count. In China, it seems that the Ritz-Carlton Hotel in Chengdu uses this one, which is said to be provided by carnations.