Although 19mm and 22mm silk pajamas have a lot in common as they belong to silk products, you should know some evident differences.
1. Wear & Tear resistance:
19 momme silk is considered the entry-level high-end silk and is pretty resistant to wear and tear. However, unlike bedding products, pajamas and other nightwear are subject to much more helpful (and washes). As such, we find that the old 19 momme silk could not satisfy our original intention for it to last up to 10 years, while the 22 momme line is easily capable of doing so.
Similar to the point above, but slightly different. While wear and tear resistance is part of the overall durability criteria, durability, in this case, refers to the fabric's ability to withstand casual or accidental mistreatment that happens on a fairly frequent basis. For example, it is not rare for our products to be mistakenly thrown into the wrong washing cycle, washed with the wrong materials/detergents, dried with a drying machine for hours on end, etc., and a lot of the time, the owners don't realize that they might have used the wrong method. Unfortunately, 19 momme silk is considerably weaker in its ability to deal with these occurrences when compared with its 22 momme counterparts.
3. Fabrics Aging:
Silk fabrics age over time and become dull, and some factors help determine the speed at which this aging process happens. Some of the most notable factors include washing frequency, water quality, amount of usage, and one factor that is often overlooked is fabric density. Lower quality silk such as the one used in women's lingerie can quickly become dull after a few washes, whereas 19 momme silk generally starts to lose its original shiny exterior after 5-6 months of usage. 22 momme silk, however, can last up to 2 years before you notice that it has begun to dull.