I had a look on the site..it`s simply a Swiss lace base with a graduated front hairline-density[standard on Toplace systems unless you specify otherwise] I`ve never had any issue with knot-visibility, but some wearers like to do their own `extra`bleaching...Debbie sells a kit for doing it, but remember, bleaching weakens hair. So to answer your final question ...the terminology/wording is simply marketing jargon.... Paul.