This is absolutely correct "lilmsrosie87". You would have to probably order a custom unit because the stock ones tend to be more full, to accommodate the majority of buyers. If the wig is indeed 100% customizable, they will allow you to choose your cap size, cap material, cap color, hair length, hair texture, hair color(s), AS WELL AS your custom density percentage.
We have a host of Lace Wig
articles you might find informative as well.