Product descriptions from the supplier ISO 20344 5.12 Standard Compliance: Used to determine the heat insulation performance of the whole shoe, with the specimen placed on a hotplate at a specified temperature for a certain period to examine the temperature increase inside the shoe. Adjustable Test Temperature: Test temperature selectable at 150 plus or minus 5 degrees Celsius or 250 plus or minus 5 degrees Celsius, with a hot plate maximum temperature of 250 degrees Celsius