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First Line Technology Phasecore PhaseCore Standard Mesh Cooling Vest

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  • Product Description
  • About First Line Technology

Standard Mesh Cooling Vests are a great solution to reduce and combat heat stress. Standard Mesh Cooling Vests use PhaseCore, a phasechange material (PCM), to provide a cooling effect to the body’s core by absorbing body heat. Standard Mesh Cooling Vests are extremely lightweight and are comfortable for use under body armor and other form-fitting protective apparel.

Users: Law Enforcement, Military Personnel, Crime Scene Investigators, Industrial Workers.

Includes: Standard Vest, PhaseCore 28 Elements (set of 16).

Size: This vest is one-size-fits-most and most comfortably fits chest sizes 33″ up to 50″.

The XS Vest is ideal for children, teens, and petite adults weighing between 40 and 110 pounds (XS Vests contain 14 cooling elements).

For chest sizes 50″ up to 61″


  • Non-Toxic
  • Machine Washable
  • Easy to Use and Maintain
  • One Size Fits Most
  • Effective Up to 3 Hours
  • Lightweight and Comfortable Design
  • Recharges at Room Temperature
  • Recharges Without Ice, Water, Refrigeration, or Electricity


  • Vest Material: Polyester Mesh Shell
  • Color: Black or White
  • Weight: 3.6 lbs. (1.6 kg) [XS Vest is 3.1 lbs (1.4 kg)]
  • PhaseCore Element: Each vest contains 16 (XS Vest contains 14) PhaseCore elements, which are made of a non-toxic, non-flammable salt mixture sealed inside an aluminum wrapper.

How does it work?

Standard Cooling Vests are fitted with a set of 16 – PhaseCore 28 elements, which have an activation point of 82.4°F (28°C). When the body temperature rises above this point, the elements begin to absorb body heat. When heat is absorbed, the PhaseCore elements provide a comfortable and soothing cooling effect. Standard Cooling Vests hold PhaseCore elements close to the body allowing them to absorb heat most effectively.

Is it effective?

Tests completed in a hot environment have proven that PhaseCore technology is effective in helping to combat the rise in a person’s body surface temperature when in a hot environment. Standard Cooling Vests are effective for up to 3 hours, actual time varies based on physical activity, body type, and the environmental conditions.

How does it recharge?

Standard Cooling Vests can be recharged by storing the PhaseCore elements in an environment less than the activation point. PhaseCore elements can be recharged more quickly in colder environments. Refrigeration is not required, but will make the recharge period shorter. PhaseCore elements are completely recharged when they return to a solid state. PhaseCore is simple, safe, and reusable.


First Line Technology designs and manufacturers disaster preparedness and response equipment like our medical ambulance bus (the AmbuBus®), our PhaseCore® Cooling Vests and our line of decontamination equipment, which includes FiberTect® dry decon wipes.

We work with first responders and the military to develop innovative products that make their jobs easier and their lives – and the lives of the people they serve – safer.

First Line has established itself as a leader in product development and deployment. We focus on emergency response missions, and pride ourselves on creating products that are comfortable, effective, and safe for use in hazardous environments.

Customer Reviews
First Line Technology Phasecore PhaseCore Standard Mesh Cooling Vest