What is the specific meaning of "120S, 80S" in hotel linen?

120S and 80S refer to the yarn count of flax, not the yarn count density mentioned upstairs.

Yarn count density is generally expressed by t, such as T200 and T400. What does yarn count density mean?

Yarn count density refers to the sum of yarn counts of warp and weft.

The specific definition of yarn count refers to the yarn weighing one kilogram at a given moisture regain, and its length is several 840 yards, which is called several yarns.

80S, 120S belong to high yarn count and are often used as bedding in high-star hotels. In China, it seems that the Ritz-Carlton Hotel in Chengdu uses this one, which is said to be provided by carnations in Jiangsu.