All the isolated gas bubbles slow down transfer of heat. It also helps that there is very little material to hold on to much heat so the heat that does transfer through it is very low and also There's lots of empty space in between all the bubbles and because it's so light people use it as an insulator.
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Yes it is a good insulator
Rubber is an object that is a good insulator.
What is a good insulator for a igloo project
A good insulator is good at stopping heat escaping, whereas a bad insulator is not very good at trapping heat and lets it out.
Yes, air is a good insulator.Yes, air is a good insulator of both heat and electricity