Question

Matter. That. Does not transfer heat easily.

Answer 1

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.