Two standards carry cut ratings in this market, and they are written differently. ANSI/ISEA 105 reports cut resistance as a level from A1 to A9, set by the load a blade needs to cut through the construction. EN 388 is the European standard: its 2016 edition reports the cut result as a letter from A to F using the ISO 13997 test, and its 2003 edition used a five-level coupe scale instead.
The two scales are not interchangeable — different blades, loads and methods — so a level is only meaningful with the standard and the edition named beside it. This page prints the level our record carries for FS-3 and names its standard; it does not convert it, and it does not repeat the older listing claim, because no result on the other scale is recorded for this construction.