Why HEATJAC
Feeling warm is not the same as staying warm.
Heated jackets are built to feel warm fast. HEATJAC is built around how your body actually keeps its heat.
Why heated jackets feel warm so fast.
Most battery jackets work at a few watts, and the long run times on the box are usually for the lowest setting.4
See the difference
Where the heat goes.
- Your body heat
- Added heat
- Warm air
- Reflective layer
Heated panels press heat into a few spots
Most battery jackets have two chest panels and one back panel against a thin lining. Their heat goes straight into those patches of skin.
Skin is the limit
Panels pressed against skin have to run at low power to stay comfortable, so the warmth stays local.
The rest of your heat is on its own
There is no reflective layer facing the body, so away from the panels your heat leaves the way it does in any jacket.
The HEATJAC approach
Keep your heat
Reflective inserts and linings face your body and send its radiant heat back.
Move added heat off the skin
Warmers sit in pockets that hold them away from your body; in CORE, the added heat warms the air under your outer layer.
Warm the trunk
CORE places warmth across the front and the full back, where the body protects its heat first.
Compare
| HEATJAC CORE™ | HEATJAC REFLECT™ | Typical battery heated vest or jacket | Warmers alone | |
|---|---|---|---|---|
| How it adds warmth | Keeps your heat in with reflective inserts; a warmer heats the air under your outer layer | Lining sends your heat back; warmers in mesh pockets add heat | Heated panels press heat into a few patches on the chest and back | A chemical warmer heats one spot |
| What sits against you | Your base layer and the reflective side of the inserts; never the warmer | Your base layer and the lining; mesh holds warmers off the body | Heated panels through a thin lining | The warmer, through a pocket or glove |
| Power | Not required. Optional power components available. | Not required. Optional power components available. | Rechargeable battery; capacity drops in deep cold7 | None |
| Heat output | Set by the warmers you choose | Set by the warmers you choose | Kept low to protect the skin: about 3 to 12 W from makers' published run times4 | One warmer at a time |
| Cooling | Yes, with cold packs | No | No | No |
| Under a uniform or gown | Designed for it | Yes | Usually worn as the outer layer | Not applicable |
| Noise and controls | Silent, nothing to set | Silent, nothing to set | Button, battery and wiring | Silent |
| Washing | Hand wash; inserts wipe clean | Hand wash | Remove the battery; follow the label | Not applicable |
Where a heated jacket is the better choice: when you want instant warmth on the chest at the push of a button, or a jacket that is its own outer layer.
Built to be simple.
Silent
Low profile
Patented pocket architecture
Manufactured in America
What we are testing.
We are building a bench-testing program on recognized ASTM methods. We will publish measured results when we have them, and not before.
Notes
Metabolic rate at rest: ISO 8996, Ergonomics of the thermal environment, determination of metabolic rate.
Human heat production and cold response: ISO 11079 and standard physiology references; see /knowledge/normal-body-temperature-thermoregulation.
Brajkovic D, Ducharme MB, Frim J. Influence of localized auxiliary heating on hand comfort during cold exposure. J Appl Physiol 85(6):2054-2065, 1998. (Cited as the physiological principle, not as a HEATJAC result.)
Watts derived from makers' published run times and battery capacities for 7.4 V consumer and 12 V tool-brand heated jackets, checked October 2026 (for example ororowear.com, milwaukeetool.com, emergencygearlab.com/tools/best-heated-jacket).
ISO 13732-1, contact burn thresholds for hot surfaces.
U.S. Consumer Product Safety Commission recalls of heated apparel, 2010 and 2013 (cpsc.gov: 2010, 2013, 2013).
Lithium battery capacity in the cold: see /knowledge/batteries-in-extreme-cold and its sources.