The purposes of this study were to compare the effectiveness of different types of thermal insulation and to compare the bag made from the best experimented thermal material with a commercial thermal bag. In calorimetry, there are five series of thermal insulation materials placed inside a calorimeter. For every experiment, aluminum foil foam was placed in the outermost layer of the calorimeter with the other types of insulation materials layered inwards: 1) aluminum foil foam, 2) foam, 3) rubber block, 4) cardboard and 5) rubber foam. During the experimental processes, the temperature of hot water was controlled at 70°C and then allowed to cool to 35°C. Each series was experimented 3 times. The best insulation material was the rubber foam with aluminum foil foam having a rate of temperature change of 0.163°C per minute. The other insulation materials—foam, rubber block, cardboard, and aluminum foil foam—had the rate of temperature change of 0.182°C, 0.185°C, 0.196°C and 0.216°C per minute. The best insulation material was used to make a thermal bag. This bag had a rate of temperature change of 0.263°C per minute, whereas the commercial thermal bag had a rate of temperature change of 0.279°C per minute.