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About our cooling technology

Glacier Tek cooling vests are powered by PureTemp, a nontoxic, biodegradable phase change material that freezes at a cool, but not cold, 59°F. The cooling technology is completely harmless to people, animals and the environment.

Weighing about 4 pounds, the Glacier Tek cool vests are comfortable and easy to use. They can recharge in about 20 minutes in ice and water, one hour in a freezer and a few hours to overnight in the refrigerator. The packs will last up to 2½ hours in a 100°F environment.

Cooling technologies offered by competitors fall short in a variety of ways:


Some PCM products use old-style petroleum byproducts, like hexadecane, which are hazardous chemicals.
  • Petroleum-based PCMs are not completely biodegradable and may take years or decades to decompose, leading to long-term effects on the environment
  • Some paraffins, and other petroleum-based products, are carcinogenic and may be toxic to plants and wildlife
  • Paraffins are derived from petroleum, which causes the price of the PCM to fluctuate based on the cost of crude oil
  • Paraffins can contribute to an increase in carbon emissions
  • Paraffins must be handled and disposed of according to hazardous material regulations in all 50 states and in most foreign countries


Ice and gel pack PCMs are bulky, have a shorter cooling time and have the strong potential to sweat.
  • A fully loaded vest with packs typically weighs between 9 and 11 pounds
  • Since ice packs solidify at 32°F / 0°C, they can cause tissue damage with prolonged exposure to skin
  • Stays cool for only a short time
  • Will melt and produce condensation - leaving the wearer uncomfortably wet


Evaporative PCM technology relies on soaking the vest in water before putting it on, which can make the wearer uncomfortable after time.
  • Will only work in warm, dry air
  • Will not work in high humidity climates, which is severely limiting
  • Can cause skin irritation, bacterial growth, mold and foul odor
  • Will not work under any protective outerwear