"Prevention of heat related injuries caused by prolonged exposure to extreme hot climate during outdoor activities in summer or fire-fighting can be addressed by cooling vests with the provision of carrying ice-packs. Since ice has large fusion enthalpy (335 kJ⁄kg), melting process of ice is capable of absorbing large amounts of thermal energy and thus can be used to protect the body from thermal injuries. The present work focuses on thermal modeling and experiment evaluation of the performance of ice-packs used for the cooling vests. Comfort duration, comfort level, weight, efficiency, width, feasibility and, safety are some of the parameters under consideration to evaluate the performance of the ice-packs.A phase change material such as ice-pack has a high heat of fusion, and thus, absorbs a significant amount of heat energy while melting. Detailed modeling of the phase change material stacked between insulators is done. The variation of temperature on the body was observed with respect to time. The selection of insulators and PCM and their sizes is done in such a way that the temperature on body side remains within the comfortable range for a significant time. A practical experiment has been setup to validate the analytical results by observing the variations in the temperature of PCM and body over the time.The body heat generation replaced by a resistance heating aluminum plate. Experiments are performed in an open environment, where suitable environment condition like high temperature and wind flow are maintained. The comparison between measured and simulated data showed reasonable qualitative and quantitative agreements, providing confidence in the developed simulation model for designing PCM cool packs for thermal comfort."