Insulating different kinds of material like structural members, important artefacts, and human life from high temperatures is a critical aspect of fire protection. Navigating through fire can pose a high risk to one's life, especially in case of firefighters, who might not even be able to reach all the parts of the building in time to rescue people or make it back from inside the building. Firefighters need protective gear to survive this high-risk job. This protective gear is made with a lining of Aramid fibre which is a lightweight insulation fabric having thermal and ballistic protective properties. Its thermal properties are of prime interest for insulation and fire protection. The objective of this work is to investigate the thermal properties of this fabric. This is done by performing experiments under the cone calorimeter setup. The material is applied on a stainless-steel substrate and substrate temperatures are compared in case of insulated and bare plates. A numerical analysis of the scenario investigates the insulation behaviour based on its properties. Finally, it is concluded that an insulation having a higher surface emissivity than its substrate cannot provide insulation unless a minimum thickness is provided based on its thermal conductivity value.