Heated Base Layers & Shirts | Battery Heated Thermals

Warmth that disappears under everything else. Heated base layers and shirts sit against your skin, heat your core directly, and add almost no bulk — so the coat you already own still fits over the top.

How to Choose a Heated Base Layer

Reviewed by The Warming Store gear team · Updated July 2026

A base layer is the one heated garment nobody sees. It goes on first, against your skin, and everything else goes over it — which makes it the answer when your outer layer isn't negotiable: a work uniform, a ski shell, a hunting parka, a coat you actually like.

Why Next-to-Skin Heating Works

Heat applied directly to your skin, under insulation, is the most efficient place to put it. There's nothing between the element and you, and everything you wear on top traps what it produces. A heated jacket has to fight through its own insulation to reach you; a base layer doesn't. It's also invisible — nobody at the office, on the chairlift, or in the deer stand knows you're wearing one.

Fit Close — This One's Different

Unlike heated outerwear, a base layer should fit snugly. Loose fabric holds the heating elements away from your skin and you lose most of the benefit. Size it the way you'd size any thermal: close, but not constricting. If you're between sizes on a base layer, size down rather than up — the opposite of the advice for a jacket.

Shirts, Pants, or Both?

Heated base layers come as shirts and as pants, and they solve different problems. Shirts carry heat across your core and back, which helps your whole body. Heated pants target thighs that go numb on a deer stand, a chairlift, or a long ride — the body part regular layering helps least. If you're only buying one, start with the shirt; if your legs are the complaint, you already know the answer.

The Battery Still Has to Go Somewhere

Base layers are thin, but the pack isn't. Most designs put it in a small pocket at the waist or hip. Check where it sits and whether that works under the clothing you'll wear over the top — a pack at the small of your back is a problem in a car seat, and one at the waist can be awkward under a tight belt.

Hunters and Riders

The two groups who lean hardest on heated base layers are hunters, who sit motionless for hours and can't add bulk over camo, and motorcyclists, whose 12V liner shirts and pants mostly wire into the bike — with some designs able to run from a battery pack as well. Hunters should cross-shop heated hunting gear; riders should start at motorcycle heated gear.

Finding the Right Base Layer

We carry battery-heated base layer shirts and pants from around $99, from brands including ActionHeat, Gerbing, Mobile Warming, Aheata, Volt Heat, FNDN, and Gobi Heat. Shop by brand with Mobile Warming heated base layers or Gerbing base layers. Most pieces come in dedicated men's and women's cuts rather than unisex sizing, so check the size chart for the cut you're buying — and remember the rule above: this is the one heated garment you size down.

FAQs

What is a heated base layer?

A thin heated shirt or thermal worn against your skin, under everything else. It heats your core directly and adds almost no bulk — which makes it the right choice when your outer layer isn't negotiable: a work uniform, a ski shell, a suit, or a coat you already own and like. Nobody sees it, which is often the entire point.

How should a heated base layer fit?

Snugly — and this is the opposite of how you'd size a heated jacket. Loose fabric holds the heating elements away from your skin and you lose most of the benefit. Fit it the way you'd fit any thermal: close, but not constricting. If you're between sizes, size down rather than up.

Can I wear a heated base layer under a regular jacket?

That's what it's designed for. The base layer heats you underneath, and whatever you wear over it traps that heat rather than letting it escape — so it actually performs better under a coat than on its own. It's also the reason a base layer works where a heated jacket won't: it doesn't ask you to give up the outer layer you already have.

Where does the battery go?

Usually a small pocket at the waist or hip. The garment is thin, but the pack isn't, so check where it sits and whether that position works under what you'll wear on top — a pack at the small of your back can be uncomfortable in a car seat, and one at the waist can conflict with a belt. It's a small detail that becomes a big one after a few hours.

Heated Base Layers, Shirts & Thermals