ESD Gloves

I found a list of ESD gloves here:
Which of the materials in this catalog would be helpful in preventing an ESD
discharge to a printed circuit board when the worker is NOT connected directly to a ground (e.g., by wrist strap)? I assume any conductive design is only useful if the worker is attached to ground. Would a rubber / nitrile style of glove insulate you, so that any static on your body is blocked and does not reach the card?

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