The fitted sheets are a step up from our 19 Momme line of fitted sheets. The extra 3 Momme makes a significant difference despite sounding like a measly upgrade. With our 22 Momme seamless silk not only do you get better sheen but the stronger fiber strength as a result of the higher quality silk fibers used gives you much more mileage on your sheet. Boasting of a 600 plus thread count per inch (TCI) our 22 Momme seamless silk fitted sheets are the top choice value-wise. The extra durability is also more needed for fitted sheets as they are in direct touch of the rough surface of your mattress and are more likely to be worn out sooner.