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First Line Technology Phasecore PhaseCore Hi-Viz Cooling Vest

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  • Product Description
  • About First Line Technology

SWEDE Hi-Viz Cooling Vests reduce and combat heat stress and are ANSI Class 2 Compliant. SWEDE Hi-Viz Cooling Vests use PhaseCore, a phase change material (PCM), to provide a cooling effect to the body’s core by absorbing body heat. The Hi-Viz material is available in orange or green.

Users: Emergency Personnel, Industrial Workers, Road Crews, Safety Officers, Public Safety Officials, Event Security, Construction Workers, Motorcyclists.

Includes: SWEDE Vest, PhaseCore 28 Elements (set of 22).

Chest size: S-M: 33″-39″L-XL: 39″-46″2XL-3XL: 46″-52″4XL-5XL: 52″-63″


  • Meets the ANSI Class 2 Standard for Hi-Viz Vests
  • Non-Toxic
  • 5 Point Hook & Loop Breakaway
  • Machine Washable
  • Easy to Use and Maintain
  • Multiple Sizes with Padded Shoulders
  • Effective Up to 4 Hours
  • Lightweight and Comfortable Design
  • Recharges Without Ice, Water, Refrigeration, or Electricity
  • Still ANSI Class 2 Compliant without Cooling Elements


  • Vest Material: High Visibility Mesh Polyester
  • Color: Orange or Green
  • Weight: 5 lbs. (2.3 kg)
  • PhaseCore Element:Each vest contains 22 PhaseCore elements, which are made of a non-toxic, non-flammable salt mixture sealed inside an aluminum wrapper.

How does it work?

SWEDE Cooling Vests are fitted with a set of 22 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. SWEDE 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 showed that an individual wearing a SWEDE Cooling Vest with PhaseCore 28 experienced only a 3.6°F (2°C) rise in body surface temperature while an individual without a SWEDE Cooling Vest experienced a 12.6°F (7°C) rise in body surface temperature. SWEDE Cooling Vests are effective for up to 4 hours, actual time varies based on physical activity, body type, and the environmental conditions.

How does it recharge?

SWEDE 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.

 Chest Size:

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 Hi-Viz Cooling Vest