Answer :

AL2006

You don't say what the insulators are insulating from ... heat or electricity.
Here are some of each:

Heat insulators:
--  Air  (between the inner and outer bottles of a thermos bottle)
--  Wood  (around the handle of a frying pan)
--  Cloth  (an oven mitt)

Electrical insulators:
-- rubber
-- plastic
-- wood
-- cloth
-- air