A conductor is a form of matter that does transfer heat easily.
A insulator is a form of matter that does not transfer heat easily.
You would be looking for insulators in this case.
Examples of conductors include:
metals, aqueous solutions of salts (i.e., ionic compounds dissolved in water), graphite, and the human body.
Examples of insulators include:
plastics, Styrofoam, paper, rubber, glass and dry air.
