Best Base Layers of 2026

The men's side of this list has a sensible starting point, and it's the set that costs about what the budget waffle knit does while putting fleece against your skin. You get a crew-neck top and a long john bottom, both lined with a soft fleece that doesn't add much under work trousers or jeans.

We recommend it for the cold you stand in: a commute, a hunting season, a job that keeps you outside, a sideline. The fleece is genuinely soft rather than scratchy, the set doesn't bunch at the knee when you bend, and the price leaves room for a second one. The catch is the cut — it runs small, and the shoulders and seat are the tight spots. Order up a size unless you want it snug.

The top is the more useful half on its own. It sits under a flannel or a work shirt without the shine of a technical base layer, and the crew neck stays below a collar. The bottoms are what you'll feel on a cold morning, and the pair together is what goes in the duffel for a December trip where you're outside for an hour at a time and inside for the rest.

The Base 4.0 leggings are the most expensive thing on this list, and they're only the bottoms. We kept them anyway, because nothing else here is built for the same conditions.

These are for standing around in serious cold — single-digit mornings, ice fishing, an oilfield shift, a tree stand. The fabric is heavy and it holds heat when you're not making any of your own, which is a different job from the light tights people wear to run in. Fit is the one place to be careful: the waistband is snug, and if you're between sizes you want the larger one.

Our judgement is that they're worth the money only when the alternative is being cold. On a ski trip, a winter job site, or a hunting season the cost per wear falls away fast; for a city winter you're far better off with a set. And because they're bottoms only, they pair with whatever top you already trust, which is how a lot of people layer in the first place.

If you already own bottoms you like and only need a top, this is where to start. Under Armour's ColdGear mock is a fitted long-sleeve with a high collar, and it does the one thing a winter top has to do: it stays tucked.

The torso is cut long, so it stays put when you reach overhead or bend to tie a boot, and the mock neck closes the gap between a jacket collar and a scarf without feeling like a turtleneck. The fabric has substance without much weight, which is why it goes under a polo for a cold round of golf and under a hoodie on a winter walk without asking you to add a sweater.

It's a base layer in the traditional sense rather than gym kit: warm under a shirt, and presentable enough that you can shed the outer layer indoors without looking like you're in long johns. That's also what makes it the top that sees the most use away from the slopes — over a T-shirt on a cool evening, or on its own when the afternoon warms up.

Of everything here, this is the piece that adapts most. It works under a shirt, under a jacket, and alone, and it takes up less suitcase room than the sweater it replaces. If your winter wardrobe is layers over a shirt rather than a full set under everything, buy this one first.

The first thing a kid does in a base layer is overheat and strip it off at halftime, so the set that wins is the one thin enough to forget about. The TELALEO boys set is that set: fleece-lined, snug, and smooth enough on the outside that a jersey, shorts, or snow pants slide over it without a fight.

The compression fit is the useful part. It stays where you put it — no riding up the calf, no bunching at the waistband under a belt — and the fleece inside is warm without the bulk that makes a kid wriggle. The size chart is the weak link: it runs small, and the pieces are cut close even then, so order up if your child is near the top of a range or built solid.

Where it stops is standing still. This is an active layer, warm enough for a cold practice, a ski school morning, or a 40-degree baseball game, not a substitute for real insulation on a January sideline. The price is the other argument in its favor: low enough that two sets in rotation through the wash is the sensible way to buy them.

Almost everything on this list is lined with fleece. The Amazon Essentials set is waffle knit, and that single difference decides who should buy it.

Waffle traps air in its texture instead of gluing a fleece to your skin, so it breathes. Under jeans it's invisible, it doesn't bunch behind the knee, and you can wear it through an overheated train carriage or a warm museum without wanting to claw it off — which is exactly the situation a winter city break puts you in. The cotton-blend knit also feels soft rather than scratchy, with nothing at the seams to chafe.

One thing to know before you order: the cut runs small and short in the leg, so tall wearers should size up and expect the ankle to sit high. Treat the fabric like the cotton blend it is — cold wash, hang dry — or it comes back shorter than it went in.

For mild cold and days when you're moving between heated interiors and cold streets, this is the set we pack. It gives up some warmth to the fleece-lined picks and gains the thing those can't offer: you can wear it all day indoors without cooking.

There's a version of this purchase where you buy three sets instead of one, and the women's WEERTI set is what that looks like: a fleece-lined top and bottom for less than the Cuddl Duds set alone, in enough colors to keep them straight in a shared suitcase.

It's warm, and it's soft — the fleece inside has a silky hand and it doesn't go crispy after a few washes. Under jeans and snow pants it layers without a bulge, and the top is presentable enough to wear on its own once a hike warms up. The pants don't roll at the waist, which is the failure that makes people give up on cheap thermals.

Our take: buy it as the second or third set, not the only one. It's the right call for a long trip where you want a clean layer every couple of days without paying premium prices for each, and it's good enough that you won't dread putting it on. Sizing splits, though — the tops run large and the bottoms run small, so check the chart piece by piece rather than ordering one size across the set.

Plenty of people only need the bottoms, and this is the least expensive way onto this list. It's a waffle-knit long john with long legs — long enough that a six-footer gets them to the boot without a gap — and medium warmth that sits comfortably under jeans.

As an extra layer for a cold commute they do the job: warm, soft against the skin, and thin enough that you forget them by lunchtime. The waist runs big, which is easy to live with — fold the band over once — and the length is the reason to choose these over a set cut short in the leg. We treat them as a consumable: the seams are the first thing to go, and at this price that's a fair trade.