In most situations, the rubber feet on tripod base mic stands are enough to keep vibrations coming from the stage deck or studio floor from impactin what the mic picks up.
If you are experiencing low frequency energy coming through the floor, you may need some additional isolation.
One of our favorite solutions for this problem is to use short lengths of foam pipe insulation and wire ties.
Take a length of foam, slip it around the tripod leg (make sure it extends over the rubber foot), and cinch it on with a couple of nylon wire ties.
If you use a pipe wrap with a reasonably small diameter you should still be able to fold the base of the stand.
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