To be insulated is to be protected from something.
To be insulated is to be protected from something, specifically it means being protected against the transfer of heat, electricity, sound, or other forms of energy. Insulation is used in a variety of settings, such as in buildings to keep heat in or out, in electrical wiring to prevent shorts, and in sound-proofing to prevent noise from entering or leaving a room. In general, insulation serves to separate and protect one thing from another.