6 1* 122 pure cotton 446g 600gsm towel. What does 600gsm mean?

I am a hotel towel, and 600gsm refers to the square meter weight of towel cloth, that is, the approximate weight of each towel = 0.61*1.22 * 600 = 446.52 grams, which is generally plus or minus 5 grams. Household towels are not very strict about the weight per square meter. Generally, the heavier the square meter, the thicker the towel. If the hotel is mass-produced, the requirement for gram weight per square meter is strict, because the unit price of towels is calculated according to the gram weight of mass production, and the conventional specifications and sizes are certain, and the gram weight per square meter determines the unit price of towels. I don't know if I have made it clear, I hope it will be useful to you!