Best Long Underwear for Women of 2026

This is the set for someone who wants to try long underwear without committing to a premium pair. It is a full two-piece, silky outside and fuzzy inside, and it feels closer to the expensive sets than we expected, with enough stretch to pull on without a wrestling match on a dark morning.

Two things are worth knowing before you order. Sizing is inconsistent, and the bottoms in particular can run small against the top, so size up if you are between and do not assume both halves will fit the same way. Give the darker colors a wash before the first wear, too: a fresh pair can bleed onto skin and onto whatever pale layer you put over it.

What you get in return is a genuinely warm, genuinely soft set that layers under jeans without a wrinkle and washes without drama. It is the one we keep as a spare, a travel set, or the pair that lives at the office, the kind you do not have to think about because there is always another in the drawer.

Thinner than our top pick and still properly warm, the PISIQI set is the one to buy if your winter clothes are already close-fitting. The knit is light, the cut is close without squeezing, and it slides under skinny jeans without a second thought. We never had to change our outfit because of it, which is the whole job and the thing most sets here get wrong.

The construction is the surprise. This is not an expensive set, but the stitching, the neckline and the way it held its shape through our washing are the best of the budget options in this guide. Nothing scratches, nothing twists in the machine, and no seam announces itself under a thin sweater. It also does not ride up, which is the failure that ruins a base layer faster than cold does.

The bottoms run big, so take the smaller size if you are between; a base layer that bags at the knee bunches under jeans and undoes the entire point. Get the size right and it is the set that disappears under the clothes you already wear, which is more than most of the thicker sets here manage.

If your idea of long underwear is the layer you pull on before a run in January, this is the pair. baleaf cuts these like athletic tights, close through the leg with a wide flat waistband and a fleece back that is warm without being stiff, and they move with you. That sounds like a low bar until you have tried to run in a set that does not.

Three pockets do more for these than the fleece does: keys, a card, a tissue, all reachable without a jacket. A large phone is a squeeze, so do not plan on carrying one. We found the warmth solid rather than extreme, which is right for movement, because you finish a cold run damper in a heavier set than you do in these.

They run small, so size up if you are near the top of a size, and they are the most expensive piece in this guide, which means set money for the bottoms alone. Under ski pants or on a cold run we think that is a fair trade; for sitting still in a chilly office, a cheap set does more for less.

Five of anything sounds like a bulk buy until you have spent a winter washing one thermal shirt every other night. That is the case for this pack: five long-sleeve tops, fuzzy inside and smooth outside, cut to sit close under a sweater without a wrinkle showing anywhere.

They are undershirts rather than a set, with no bottoms included, which makes them the right buy if your legs run warm or you already have leggings you trust. The knit stretches easily over your head and then holds close enough to trap heat the way a base layer should, and the inside has a brushed, almost fuzzy feel that is pleasant at six in the morning.

Five tops means there is always a clean one, nothing to match, and nothing to think about on a dark morning. Bought as a pack and worn as undershirts, they are the least fuss of anything in this guide, and they beat a second full set if your legs are not the part of you that gets cold.

This is the one set here that is not trying to be fleece. It is a waffle-knit cotton blend, breathable and slightly textured, much closer to a pajama than to expedition gear, and that is the entire point of it.

Where it earns its place: a heated office, a cold bedroom, a long drive, the sort of chill where you want one more layer and not a furnace. Cotton does not get that slick, clammy feel that a fleece-lined synthetic can after a few hours indoors. It is also the set we end up wearing to bed, which is not a small thing in January.

It is the wrong choice for anything active, because cotton holds moisture and a sweaty walk leaves you colder than before, and it is not as warm as the fleece-lined sets. What it is instead: the most breathable thing in this guide and the least technical-feeling, which is precisely what some people want from a winter layer.

At 4.64 ounces these weigh about what a pair of socks does, and that is the appeal: pulling them on under jeans is barely an event. No bulk, no adjusting, no visible line. It is the layer you pack when the cold is a maybe rather than a certainty.

Warm for the weight is the other half of it. Thin as they are, they are noticeably warmer than bare legs in the same jeans, and they add nothing you would notice in a mirror. The waistband sits flat and does not roll, they stay where you put them, and they are long enough for taller wearers, all things that sound minor until a pair gets them wrong.

Where they sit against the other bottoms here is simple. The baleaf leggings are warmer and tougher and cost accordingly; these are the lighter, cheaper, packable option, and for a cold commute rather than a cold mountain that is the better trade of the two.

For a trip, a morning walk, or a pair of jeans that will not take anything thicker, these are the ones we pack. They are not the pair you wear every day of a ski week, and they do not pretend to be.

Silky outside and brushed inside, the WEERTI set gets the feel right. It is soft enough to wear against skin all day, thin enough to vanish under jeans, and light enough that you stop noticing it is a second layer at all.

We found the warmth decent rather than exceptional. It handles a cold commute, a winter walk and a badly heated office comfortably, and it is not what you would take up a mountain. Layering is where it shines: under jeans, under snow pants, under work clothes, without a wrinkle or a ridge showing through.

It is a thin set, thinner than the Cuddl Duds and closer to the PISIQI in weight, so treat it as a layer rather than as insulation. It washes and dries without fuss and keeps its softness, which is more than you can say for every budget set at this end of the market.

For a cold-weather trip where a set might get stained, lost or worn three days running, this is what we pack: good enough to do the job, inexpensive enough not to fret over, and light enough to bring two.