Mr Unknown. I don''t know what Hidden Knots are. The knots up front need to be bleached by the factory or by you as the front (and the entire perimeter of the piece actually) is regualar SFS or French lace.

IMHO there are absoltely no problems with attachemnt, heat, breathibility, detectibility to the touch or sight WHEN YOU HAVE A LACE PERIMETER surrounding the I-Lace.

-BUT-

There were pieces I had in the past that were no good for me - they were ALL I-Lace and just a smidge of SFS up front - these were problematic with attachement and detectibility. Especially if you need to cut into the I-Lace on the horseshoe and/or having a short style and/or low density.

These I-Lace island pieces for the past 3 years are awesome. But according to BA no one wears them except for him and me.