Straley Reality Cables... RE: coverings

I read that the covering affect the sound but there wasn't much written about it. Has anyone had both covered and raw Reality Speaker cables? How would you describe the difference?

The cables appear red or magenta in the pics on the site. Odd color. Seems black and white covers are available.

Covering will affect the transmission properties over many miles.
My money is one no one having compared covered versus uncovered except for Gregg...

He recommends uncovered or white cotton, and he claims the black covering affects the sound, whereas the white cotton does not.
Greg is as meticulous and honest as they come. He hears an advantage to the uncovered version. If he says he tested it and came to a conclusion, you can believe he heard a difference. That guy is a genius at a/b comparisons.