As an engineer, I once opined to a fellow engineer, I wonder how Static Guard works? And he said, "You know what causes static electricity?" Naturally, I said yes. He said, "It makes that go away."
An almost-correct answer if you remember your elementary school science class with charges on glass and amber... Amber being elektron (ἤλεκτρον) and the root of the word electricity. If you coat the amber (or polyester) so it no longer holds a charge, by pairing its charge carriers with molecules that hide them, then you have static guard.