John,
That is correct. The SFS gives you an undetectable hairline to blend with your scalp and the ILace does the rest of the job. Remember, we carry a narrow line of bases---only the best. We've eliminated the fine monofilament and wielded mono bases with a lace front. All of our bases give the most undetectable look available. Some of our bases are better for your personal needs than others depending on your hair style and life style.
Regards,
John