What is Phase Change Cooling?

• A phase change cooling vest makes use of cooling packs that maintain much higher temperatures. These phase-change packs often contain liquids (typically nontoxic oils and fats) that solidify (like wax) typically between 55 to 65 degrees and usually last between 4 – 6 hours.
• Inserts inside the vest can house the Phase change materials that need to be cooled in the fridge or ice water to activate the PCM (Phase change material). There are also Phase Change Materials that recharge Without the need to immerse them in ice, chilled water, refrigeration, or Electricity. 
• Some argue that the Phase Change Cooling Vests and accessories are heavy, but that completely depends on the persons' strength and purpose.
• Advantages to using PC cooling vests are that they can be worn on top of your clothing and uniforms, reusable and easily re-charged, can be used in confined spaces, and explosive environments (intrinsically safe areas). 
• Also Phase Change Cooling can benefit persons who have Multiple Sclerosis, Breast Cancer, Ectodermal Dysplasias and Thermogenic Anhidrosis.

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Some more examples of Athletes using PHASE CHANGE COOLING VESTS - 

This is the KEWLFIT Performance Endurance Vest ideal for Athletes and Fitness enthusiasts.

Below is a product from FIRST LINE TECHNOLOGY (USA) - PHASE CORE which does not require to recharge the PCM in ice, chilled water or refrigeration thus no Electricity is required. Perfect for situations where no power is available. Ideal for Firefighters and Outdoor Security Services. see images & video below: 

This type of Phase change vest is particularly versatile due to its activation only when the body temperature increases. Thus it doesn't freeze you continuously just when you get hot! Which is a good idea!