Excellent points. But for

AvatarSpace Racer

Excellent points. But for wrapping your mic to fit the holder I would suggest a material from the craft store called Fun Foam.
It’s a flexible, tough, black, closed-cell foam that is easily cut. It’s about 1/8 inch thick and comes in 8×10 sheets.
And with a strip of gaff tape, it makes a great camera flag. It comes in a variety of colors including white so you can make reflectors and props with it.
There’s also a version with adhesive on one side.

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