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.

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.

Built as infrastructure, worn as a layer.

Ultra-low-profile harness and liner construction that disappears 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.

Easy-care construction, built for repeated real-world use (see the care and fit guide included with every unit).

  • Our heat-reflective lining returns up to 95% of radiant body heat, based on material testing to ASTM C1371. The cheapest watt of warmth is the one you do not lose.

  • 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. Contact warming, with a different profile than forced-air approaches.

  • The platform accepts long-life warming elements of the user’s choice and supports cooling configurations. No proprietary battery lock-in and no disposable dependency.