Lexicon: N
Net size
The net size – also called the visible size or finished size – is the finished, later visible size of the banner. This is exactly the dimension you order in the shop; all size details refer to it.
It must be distinguished from the seam allowance: an additional border created all around the net size and later finished into the seam. This border disappears during finishing and is no longer visible on the finished banner.
For your print data this means: create the file at the net size plus the relevant seam allowance, background running off the edge, important content kept a safe distance from the edge.