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The cool vest we is vest like, with 4-6 pcs ice pack inside the vest. The ice pack need to put into the refrigeratory for hours before use, when it needs to be used, take out the ice pack and then put it back to the vest. Then it can be used. It can keep cool for about 2-4 hours in about 24 degree. It is suitable for the person wears the mascot costume, work outdoor in summer, work in high temperature.