THERMAL ARCHITECTURE · PHYSICIAN DESIGNED
Thermal architecture, explained.
What makes HEATJAC a technology company is not that our products warm you. It is how the system decides where warmth goes.
PRINCIPLES
The human body is not uniformly cold.
It loses heat fastest from the core and redistributes blood away from the extremities to protect it. Most warming products ignore this: they heat a patch of fabric and hope.
HEATJAC’s architecture is built on three engineering decisions.
THE PLATFORM
Built as infrastructure, worn as a layer.
Ultra-low-profile harness and liner construction that stays low profile under scrubs, uniforms, body armor, or outerwear. Adjustable fit across body types. Breathable where the body needs to shed heat, reflective where it needs to keep it.
Hand wash in cold water; see the care and fit guide included with every unit.
Capture and use what the body already produces
Our heat-reflective lining returns up to 95% of radiant body heat, based on the lining material's rated reflectivity (ASTM E408). The cheapest watt of warmth is the one you do not lose.
Broaden the thermal source: no hot spots
The patented Thermal Cell Array™ positions configurable thermal zones across the core and torso, taking heat from a centralized source and spreading it across a wider area of the body.
Source-agnostic: use what is best for the situation
The platform takes air-activated warmers or cold packs, for warming or cooling.

The heat path
Where the heat goes.
Pick a product to see how heat moves through the layers.
Watch it on a person: CORE film · REFLECT film

- Your body heat
- Added heat
- Warm air
- Reflective layer
The insert returns your body heat
Three reflective inserts face your body, over a base layer. Radiant heat that reaches them is sent back toward you.
The warmer heats the air under your outer layer
The warmer sits between the insert and the outer pocket fabric. Its heat goes outward, into the air under your jacket or gown, not into one spot on your skin.
You lose less heat
Warm air builds up between CORE and your outer layer, so less of your own heat leaves your body. CORE works best with an outer layer over it.
INTELLECTUAL PROPERTY
Protected and expanding
The architecture is protected by two issued U.S. utility patents covering the wearable platform itself: the panel, liner, and thermal-pocket architecture that makes configurable body-zone warming possible.
- U.S. Patent 8,671,464 (issued 2014)
- U.S. Patent 9,980,526 (issued 2018)
DEVELOPMENT PROGRAM
Built to keep developing
Behind the issued patents is an active engineering program. HEATJAC™ maintains a development roadmap that extends the architecture into new materials, new warming and cooling configurations, and new environments, with additional patent filings in preparation. We are building a bench-testing program on recognized ASTM standards; results are published once measured.
We describe that work publicly when it is protected and proven, and not before.

standards
Measured. Not Marketed.
HEATJAC™ states performance the way engineers do: as measurable properties tied to recognized standards. Our reflectance figure is a material rating under ASTM E408. As our testing program expands to additional recognized thermal standards, published performance will expand with it.

go deeper
The science of staying warm should be public. Visit the HEATJAC™ Knowledge hub: how the body loses heat, how heating technologies compare, and what the standards actually measure.
- Physician designed
- Two U.S. patents
- Hand wash care guide included
- Volume pricing for teams
- Questions: contact@heatjac.com · 1-888-866-8450