In a nutshell 💡
- Insulated clothing does not generate any heat. It simply slows down the loss of the heat your body produces—nothing more.
- Heated clothing, on the other hand, provides heat from an external source through electrically powered elements.
- The difference becomes apparent when the body can no longer produce enough heat: when you’re at rest, in extreme cold, or when blood circulation is impaired. Insulation then becomes ineffective.
- The two complement each other: a heated garment without insulation dissipates its heat into the air.
- Battery life isn’t a fixed limitation: it depends on the heat setting, which is adjustable.
You know the feeling: your down jacket is thick, you’re wearing several layers, and yet the cold eventually seeps through. Not all at once, but gradually—first through your hands, then your feet.
That moment reveals exactly the limit of insulation. A down jacket doesn’t warm you up—it retains the heat you produce. When that heat production drops—because you’re standing still or the cold has lasted too long—there isn’t much left to retain.
That’s the key difference between insulating clothing and heated clothing. Here’s what each actually does, when one is enough, and when it’s no longer enough.
See also: Cold, rain, heat waves… The guide to clothing for year-round gardening
What insulating clothing does
Insulating clothing traps air. That’s the whole principle: it’s not the material that insulates, it’s the still air it traps. Air is a very poor conductor of heat—as long as it isn’t moving.
Down, wool, fleece, synthetic batting: all these materials aim to do the same thing—create a stable volume of air between your skin and the outside. The thicker and more stable this air pocket is, the longer it takes for heat to escape.
What Sets These Materials Apart
- Down offers the best warmth-to-weight ratio, but loses most of its insulating properties once it gets wet
- Wool, particularly merino, retains some of its insulating power even when wet and regulates moisture better
- Synthetic fillings hold up well against moisture and dry quickly, offering greater loft for the same quality
- Fleece insulates adequately but lets wind through, making it best suited for mid-layers
This insulating power is measured using specific units—the clo and the tog—which quantify a fabric’s thermal resistance. These are useful benchmarks for comparing two products, but they tell you only one thing: how quickly your body heat escapes.
The limitation—and it’s structural
An insulating garment depends entirely on what your body produces. As long as you’re walking, working, or moving, your muscles generate heat that fuels the system, and the insulation does the rest.
As soon as that heat production drops, the mechanism reverses. When you’re at rest, stationary, on a chairlift, or during a break on a construction site, there isn’t enough heat left to retain. You can add layers, but you’ll only slow down a cooling process that’s already underway.
This explains that common experience: feeling cold even when you’re bundled up.
What a heated garment adds
Heated clothing introduces an external heat source. Heating elements built into the fabric, powered by a removable battery, generate heat and distribute it to specific areas.
The difference is one of nature, not of degree. Insulation slows heat loss, while heating adds heat. The former depends on you; the latter does not.
In practical terms, this changes three things:
- Inactivity is no longer a problem, since the heat no longer comes from muscle activity
- The intensity is adjustable—usually across several levels—which no insulation can provide
- Specific areas are targeted: the back, lower back, chest, and hands—the places where the cold sets in first
The comparison
| Criterion | Insulating clothing | Heated clothing |
|---|---|---|
| Source of heat | Your body | An electrical source |
| Effective when stationary | Low | Yes |
| Adjustable | No, except by adding layers | Yes, by levels |
| Targeted areas | No | Yes, kidneys, back, chest, hands |
| Requires a battery | No | Yes, removable |
| Required volume | Important, thickness provides insulation | Reduced, warmth does not come from thickness |
| Works without technical maintenance | Yes | Battery charging required |
When insulation is enough, and when it is no longer enough
The question isn’t which is better, but what situation you’re in.
Insulation is sufficient when you’re generating heat
Brisk walking, running, strenuous physical activity, hiking uphill. In these cases, your body produces more than enough heat on its own, and the real risk is actually overheating followed by cooling down through sweating. A heated garment would be unnecessary in these situations.
It is no longer sufficient in four situations
- Prolonged inactivity in cold weather: a stationary workstation, hunting, fishing, spectating, waiting at a construction site
- Alternating between exertion and rest: the chairlift between runs, outdoor breaks, cycling followed by a red light
- Damp or windy cold, which accelerates heat loss and reduces the insulating effect
- Poor circulation in the extremities, particularly in cases of Raynaud’s syndrome, where fingers get cold despite wearing highly insulating gloves
This last case, in fact, led to the creation of G-Heat, as one of its founders is affected by it.
Heated clothing by use
The choice depends on the area you want to keep warm and what you’ll be wearing over it.
As a mid-layer, a heated zip-up hoodie slips under a jacket and targets your back and lower back. It’s ideal for days when you’ll be moving between indoor and outdoor settings.
As an outer layer, a heated softshell jacket combines wind protection and warmth, solving both problems at once. The ESSENTIAL heated down jacket takes insulation a step further, for truly cold temperatures. Other models include heated jackets and heated down jackets.
Three guidelines for deciding between a heated jacket and another garment:
- A heated jacket is worn as an outer layer and protects from the wind in addition to providing warmth: it’s the go-to choice for extended time outdoors
- A heated down jacket adds insulating padding to the heating system, for the coldest temperatures
- A vest or hoodie slips under an existing jacket when you don’t want to change your entire outfit
Heated jackets and heated down jackets therefore address two distinct needs, not two price tiers.
For minimal bulk, the line of heated vests targets the torso without restricting arm movement, making them ideal for technical tasks. And when the cold first sets in at the extremities, it’s the heated gloves that make the difference—long before you’d need an extra jacket.
Which heated clothing for which winter?
The choice depends less on the temperature reading than on what you’re doing outdoors. Four scenarios come up consistently.
- Outdoor work: construction, logistics, agriculture, road maintenance. Long days, alternating between physical exertion and downtime, often in damp weather. Heated jackets and vests are best suited for this, worn under regulation work clothing.
- Winter sports and outdoor activities: skiing, winter hiking, biking. The alternation between exertion and rest is at its peak, and it’s on the lifts or during breaks that heated clothing really comes into its own.
- Stationary outdoor activities: hunting, fishing, wildlife photography, sports coaching. There’s no muscle-generated heat, so no amount of insulation can compensate over time.
- Daily life and mobility: commuting by bike, waiting for public transportation, winter walks. A discreet heated jacket replaces three bulky layers in these situations.
Heated clothing doesn’t replace your winter wardrobe; it determines the exact point at which it reaches its limit. Over a full workday, a heated jacket set to the lowest setting is better than a very thick down jacket that restricts movement.
Don’t miss: Why Do My Legs Feel Cold? A Guide to Understanding and Taking Action
Battery Life and Capacity
This is the question that comes up time and again, and the answer boils down to one principle: battery life depends on the heat setting. On the lowest setting, a garment lasts significantly longer than on the highest.
In practice, the highest setting is used at the start to bring the temperature up quickly, then you turn it down one notch to maintain the heat. That way, you can easily get through a whole day.
The battery is removable, which has two useful benefits: you can remove it before washing, and you can bring a second one along to double the battery life on a long outing.
Three habits can significantly extend the battery life throughout the day:
- Start at the highest setting and then lower it once the desired temperature is reached, rather than staying at maximum
- Turn it off during periods of physical exertion, when your body generates enough heat on its own, and turn it back on when you stop
- Keep the battery warm when not in use: cold temperatures temporarily reduce the capacity of any lithium battery
Cold-Weather Standards
There are two standards for cold-weather protective clothing in the workplace: the EN 342 standard for cold-protective suits, and the EN 511 standard for gloves protecting against convective and contact cold.
These standards measure insulation performance, not the presence of a heating system. A garment can therefore meet these standards perfectly well yet still leave you feeling cold when at rest, since they evaluate heat retention, never heat generation.
Key points to remember before purchasing for professional use:
- An insulation standard says nothing about heating—these are two distinct performance characteristics
- Heated clothing is most often worn under required protective gear, which remains compliant
- High visibility is governed by yet another standard, which must be verified separately depending on the job
To learn more: Heat waves at work: how to stay productive without putting yourself at risk?
Care instructions: the real difference in everyday use
Contrary to what many people think, heated clothing can be washed, provided you follow a few simple rules:
- Remove the battery first, without fail
- Close the zippers and follow the care instructions on the label
- Air-dry—never use a dryer or place it on a radiator
- Do not iron the areas containing the heating elements
- Store the battery at about half charge in a temperate location if the garment will be stored for several months
The question we’re asked most often is why a very thick down jacket isn’t enough. The answer is simple: it retains your body heat, but it doesn’t generate it. When you’ve been standing still for twenty minutes, there isn’t much body heat left to retain.
— Édouard Castaignet, co-founder of G-Heat
Why Choose G-Heat
G-Heat has been designing thermal regulation gear since 2017, following one of its founders’ diagnosis with Raynaud’s syndrome. This origin explains our approach: we don’t seek to replace insulation; we address the moment when it’s no longer enough.
Each item specifies its heating zone, adjustment levels, and battery type, so you can make your choice based on verifiable criteria. The entire lineup can be found in the heated clothing section.
Conclusion
Insulated clothing retains the heat you generate. Heated clothing provides heat that you’re no longer generating. These aren’t two versions of the same product—they’re two solutions to two different problems.
The rule of thumb is simple: if you feel cold while moving, you need more insulation. If you’re cold while at rest, despite wearing layers, no additional insulation will solve the problem.
Whatever the weather. G-Heat, in any weather.
Frequently Asked Questions
Does heated clothing replace a down jacket?
No, it complements it. The heating system needs an insulating layer to trap the heat it generates; otherwise, that heat dissipates immediately into the air. The best results come from combining the two.
Why am I cold even though I’m bundled up?
Because insulation only slows down the loss of your own body heat. When you’re at rest or exposed to cold for an extended period, your body’s heat production decreases, and there isn’t enough left to retain. Adding layers doesn’t generate any additional heat.
How long will a heated garment last on a single charge?
This depends directly on the heat setting used. The maximum setting is used to bring the temperature up, then you turn it down one notch to maintain it. A second battery can double the battery life on a long outing.
Can you wash a heated garment?
Yes, after removing the battery, following the care instructions on the label. Air-dry only—never use a dryer—and do not iron the heating zones.
What do the EN 342 and EN 511 standards mean for heated clothing?
They evaluate protection against the cold based on insulation, not the presence of a heating system. Therefore, even compliant clothing may still leave you feeling cold when you’re not moving.
Is heated clothing suitable for Raynaud’s syndrome?
It compensates for thermal deficiency and allows you to continue an activity, which is precisely the brand’s origin. It does not cure the syndrome, and medical advice is still necessary in cases of severe symptoms.
Is the battery removable?
Yes, on our heated clothing. You can remove it for washing, carry a second one as a spare, and the garment can also be worn without a battery, just like regular clothing.
Sources and References
[1] “Working in the Cold: What You Need to Know”, INRS
[2] “Raynaud’s Disease”, Vidal
[3] “Frostbite: Injuries That Require Prompt Treatment”, Assurance Maladie
[4] “Extreme Cold: What Are the Health Risks?”, Santé publique France
[5] “Personal Protective Equipment Against the Cold”, INRS
[6] “EN 342 and EN 511 Standards: Protective Clothing Against the Cold”, AFNOR
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