Techflex: strong, light, a little stiff, variable size, microphonic
Nylon multifilament: somewhat strong, light, flexible, not microphonic
I can't say I know too much about actual shielding, but I think certain braids/twists of CAT5 minimize the effects of interference. Putting some sort of sheathing is mostly just for cosmetic/practical purposes. Techflex is the sleeving they put on most computer power supply cords nowadays.
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