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Warm Undergarments

Find warm undergarments for the first layer of your outfit. Explore base-layer styles with your preferred fit in mind, and check each item’s sizing and product details to choose pieces that work under your other clothing.

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Men's Two-Layer River Driver's Shirt®, Traditional Fit Henley
L.L.Bean Men's Two-Layer River Driver's Shirt®, Traditional Fit Henley
A classic Henley with a wool blend outer layer and soft cotton inner, in black cherry heather.
(6,147)
$79.95 $79.95
SALE
What customers like:
Good quality
Warmth
True to size
Versatile
Comfortable fit
$79.95 $79.95
SALE
Women's PrimaLoft ThermaStretch Fleece Pocket Tights, Mid-Rise
L.L.Bean Women's PrimaLoft ThermaStretch Fleece Pocket Tights, Mid-Rise
A pair of mid-rise black tights with plush fleece interior, moisture-wicking fabric, and handy pockets.
(2,111)
$120 $120
SALE
What customers like:
Fit
Warmth
Softness
Comfortable
Pockets
$120 $120
SALE
Men's Scotch Plaid Flannel Boxers
L.L.Bean Men's Scotch Plaid Flannel Boxers
A pair of ultrasoft 100% cotton flannel boxers in black watch tartan with a comfortable elastic waistband.
(1,634)
$39.95 $39.95
SALE
What customers like:
Excellent quality
Warmth
Roomy design
Soft fabric
Comfortable fit
$39.95 $39.95
SALE
Women's PrimaLoft ThermaStretch Fleece Tights, Mid-Rise
L.L.Bean Women's PrimaLoft ThermaStretch Fleece Tights, Mid-Rise
A pair of mid-rise black fleece/nylon tights with a plush interior and moisture-wicking waistband.
(1,413)
$110 $110
SALE
What customers like:
Great fit
Soft and cozy
High quality
Very comfortable
Exceptional warmth
$110 $110
SALE
Women's Silk Pointelle, Pants
L.L.Bean Women's Silk Pointelle, Pants
A virtually weightless pair of cream silk pants with a feminine pointelle-knit and elasticized waist.
(881)
$69.95 $69.95
SALE
What customers like:
Comfort
Light weight
Warmth
Softness
Good fit
$69.95 $69.95
SALE
Women's Silk Underwear, Scoopneck
L.L.Bean Women's Silk Underwear, Scoopneck
A black silk long-sleeve undershirt offering comfortable warmth without bulk, perfect as a first layer.
(639)
$54.95 $54.95
SALE
What customers like:
Great fit
Lightweight
Warmth
Silky feel
Comfortable
$54.95 $54.95
SALE
Women's Perfect Fit Pants, Fleece-Backed Leggings
L.L.Bean Women's Perfect Fit Pants, Fleece-Backed Leggings
A cozy pair of black fleece-backed leggings with a mid-rise fit, made from a cotton blend.
(560)
$74.95 $74.95
SALE
What customers like:
High quality
Attractive color
Warmth
Cozy fleece
Comfortable fit
$74.95 $74.95
SALE
Men's Two-Layer Union Suit
L.L.Bean Men's Two-Layer Union Suit
A supersoft, roomy red union suit with a wool blend for warmth and itch-free cotton interior.
(541)
$99.95 $99.95
SALE
What customers like:
Functional
Fits well
Well-made
Warmth
Comfortable
$99.95 $99.95
SALE
Men's Cresta Wool Midweight 250 Crew Top
L.L.Bean Men's Cresta Wool Midweight 250 Crew Top
A dark black, itch-free merino wool crew top that wicks sweat, resists odor, and keeps you warm.
(489)
$99.95 $99.95
SALE
What customers like:
Comfort
Softness
Warmth
Durability
Good fit
$99.95 $99.95
SALE
Men's Silk Underwear, Pants
L.L.Bean Men's Silk Underwear, Pants
A lightweight, solid red silk base layer pant offering warmth and comfort without bulk.
(486)
$54.95 $45.99
SALE
What customers like:
Provides warmth
Well made and sturdy
Prevents chafing
Comfortable fit
Lightweight and thin
$54.95 $45.99
SALE
Men's Cresta Midweight 250 Pants
L.L.Bean Men's Cresta Midweight 250 Pants
A versatile base layer made of itch-free merino wool, wicking sweat and resisting odor in dark black.
(439)
$99.95 $99.95
SALE
What customers like:
Great color
Versatile use
Soft and lightweight
Excellent warmth
Comfortable fit
$99.95 $99.95
SALE
Women's Silk Underwear, Turtleneck
L.L.Bean Women's Silk Underwear, Turtleneck
A lightweight, black silk turtleneck providing breathable warmth without bulk, perfect under casual or active outfits.
(424)
$69.95 $69.95
SALE
What customers like:
Soft and warm
Excellent customer service
Thin and comfortable
Great turtleneck fit
Lightweight and warm
$69.95 $69.95
SALE
Men's Silk Underwear, Crewneck
L.L.Bean Men's Silk Underwear, Crewneck
A lightweight black silk crewneck providing strong, comfortable warmth as a perfect base layer.
(410)
$54.95 $54.95
SALE
What customers like:
Durable
Comfortable
Warm
Great for travel
Feels like real silk
$54.95 $54.95
SALE
Women's Cresta Midweight 250 Pants, High-Rise Slim-Leg
L.L.Bean Women's Cresta Midweight 250 Pants, High-Rise Slim-Leg
A high-rise, slim-leg base layer made of 100% merino wool, perfect for warmth and odor resistance.
(390)
$99.95 $99.95
SALE
What customers like:
Great fit
High-quality fabric
Non-itchy material
Comfortable to wear
Excellent warmth
$99.95 $99.95
SALE
Men's Double-Layer Underwear, Crewneck
L.L.Bean Men's Double-Layer Underwear, Crewneck
A dark indigo wool blend crewneck with double-layer construction for superior warmth and comfort.
(376)
$54.95 $54.95
SALE
What customers like:
Perfect fit
Exceptional warmth
High comfort
Well made
Soft feel
$54.95 $54.95
SALE
Men's Cresta Midweight 250 Quarter-Zip Top
L.L.Bean Men's Cresta Midweight 250 Quarter-Zip Top
A dark black merino wool quarter-zip top that wicks sweat, resists odor, and keeps you warm.
(375)
$120 $120
SALE
What customers like:
Keeps you warm
Excellent base layer
Comfort
Durability
Versatility
$120 $120
SALE
Women's Cresta Midweight 250 Crew Top
L.L.Bean Women's Cresta Midweight 250 Crew Top
An eggplant heather merino wool crew top that wicks sweat, resists odor, and keeps you warm.
(364)
$99.95 $84.99
SALE
What customers like:
Great fit
Breathable fabric
High quality
Soft and comfortable
Excellent warmth
$99.95 $84.99
SALE
Women's Cresta Midweight 250 T-Zip Top
L.L.Bean Women's Cresta Midweight 250 T-Zip Top
An eggplant heather merino wool base layer that wicks sweat, resists odor, and features thumbhole cuffs.
(203)
$120 $99.99
SALE
What customers like:
Well-made
Warmth
True to size
Versatile
Comfortable
$120 $99.99
SALE
Men's Cresta Ultralight 150 Crew Top
L.L.Bean Men's Cresta Ultralight 150 Crew Top
An alloy gray, 100% merino wool crew top offering lightweight warmth and comfort with thumbhole cuffs.
(157)
$89.95 $89.95
SALE
What customers like:
Soft material
Warmth
Good fit
Comfortable
Versatility
$89.95 $89.95
SALE
Women's Cresta Ultralight 150 Crew Top
L.L.Bean Women's Cresta Ultralight 150 Crew Top
A remarkably soft, itch-free merino wool crew top in alloy gray, perfect as a lightweight base layer.
(147)
$89.95 $89.95
SALE
What customers like:
Not itchy
Lightweight
Warmth
Versatile
Comfortable
$89.95 $89.95
SALE
Men's Cresta Wool Ultralight 150 Pants
L.L.Bean Men's Cresta Wool Ultralight 150 Pants
An ultralight base layer made of 100% merino wool, offering warmth and odor resistance in alloy gray.
(142)
$89.95 $89.95
SALE
What customers like:
Stylish design
Lightweight feel
Durable material
Warm without bulk
Comfortable fit
$89.95 $89.95
SALE
Women's L.L.Bean Simple Soft Base Layer, Crew
L.L.Bean Women's L.L.Bean Simple Soft Base Layer, Crew
A lightweight, moisture-wicking base layer crewneck in Sea Salt, made from 94% polyester and 6% spandex.
(127)
$54.95 $54.95
SALE
What customers like:
Great fit
Smooth fabric
Softness
Dino style
Material
$54.95 $54.95
SALE
Women's Cresta Ultralight 150 Pants, High-Rise Slim-Leg
L.L.Bean Women's Cresta Ultralight 150 Pants, High-Rise Slim-Leg
A high-rise, slim-leg base layer made of 100% merino wool, providing warmth and comfort year-round.
(119)
$89.95 $89.95
SALE
$89.95 $89.95
SALE
Women's L.L.Bean Simple Soft Base Layer, Pants
L.L.Bean Women's L.L.Bean Simple Soft Base Layer, Pants
A lightweight, moisture-wicking base layer pant in Sea Salt, made from 94% polyester and 6% spandex.
(116)
$54.95 $54.95
SALE
What customers like:
Adds extra warmth
Lightweight
Softness
Good fit
Comfortable
$54.95 $54.95
SALE

Warm Undergarments

Warm undergarments are clothing layers worn beneath an outfit for added warmth. Often described as thermal underwear or base layers, they form the starting point of a layered wardrobe, with fit and personal preference playing an important part in the choice. Because these garments sit closest to the body, the details deserve attention: the shape of a neckline, the position of a waistband, the length of a sleeve and the way one layer meets another. A familiar size is a useful starting point, but measurements and the individual garment’s size information offer a clearer picture than the size label alone. Some people prefer a close silhouette beneath their clothes; others like a little more room. Neither preference calls for accepting pinching, pulling or extra fabric that gathers where it is not wanted. Think about a sleeve beneath another sleeve, a cuff at the ankle or a waistband beneath a second waistband. These small points of overlap can matter just as much as the overall size. The clothes worn over an undergarment are part of the decision, too. A narrow pant leg leaves a different amount of room than a relaxed one, while an open neckline reveals more of the layer beneath it than a higher neckline does. Product photographs, measurements and fit descriptions can help clarify those relationships before a choice is made. Warmth is the defining consideration for this collection, but it is not a reason to overlook proportion or personal style. A layer that fits into an existing wardrobe is a more considered choice than one selected on a warmth description alone. For another view of this wardrobe category, explore Cold Weather Underwear, keeping the same attention to the details of each garment. The aim is a thoughtful selection of undergarments that reflects how someone likes their clothes to fit, feel and look together.

Material composition is another useful point of comparison, and the most reliable information comes from the details attached to each garment. A fabric name does not tell the whole story of an undergarment, nor does a photograph establish how it will feel against the skin. Composition, fabric description, construction and care instructions all contribute to a fuller understanding. For anyone with a known fabric preference, checking the complete composition is particularly worthwhile rather than relying on a broad category name. The same attention applies to fabric weight: where a weight or thickness is provided, it offers another detail to consider alongside the garment’s cut and measurements, not a substitute for them. Personal preferences can be quite specific. One person may pay close attention to the inside of a seam, while another notices the feel of a collar or the placement of a label first. Those preferences are worth keeping in mind when comparing the information provided. Fit is similarly individual from one part of the body to another. Sleeve length, torso length, rise and inseam may influence a choice differently, especially when someone falls between sizes. Where separate garments are offered, checking each size independently avoids assuming that the same size will be right throughout. Trying layers together also gives a more realistic impression than considering an undergarment by itself. Sitting in a chair, bending a knee and reaching forward can reveal a waistband that presses or a sleeve that pulls back. These are ordinary movements, but they make the fit easier to judge. A mirror can show whether fabric gathers beneath an outer layer; movement helps establish whether the proportions suit the wearer. Rather than treating every base layer as interchangeable, consider the shape, feel and finish of each garment as parts of the whole. Those details make the choice personal without making it complicated.

Care and durability belong in the comparison from the beginning, not only after an undergarment reaches the laundry basket. Check the garment’s care label for washing and drying directions, and consider how those instructions fit into the household routine. It is better to know in advance that a garment calls for a different approach than to discover it after washing several layers together. Follow the stated instructions rather than assuming that all thermal underwear can be treated alike. Any guidance about water temperature, drying method or other care steps should come from the garment’s own label. Durability also deserves a specific, practical look: use the construction information supplied for the garment rather than taking a category name as a promise about how long it will last. Over time, checking seams, cuffs and waistbands gives a clearer sense of a garment’s condition than judging by appearance alone. A drawer arranged so that undergarments are easy to see can also make getting dressed less of a search, particularly in a household where several people have similar clothing. Keeping size and care information with a new garment until it has been tried on is a simple way to avoid confusion. Warm undergarments can be a thoughtful gift for someone whose preferences are well known, though close-to-body clothing makes accurate sizing especially important. The recipient’s usual measurements, preferred fit and fabric preferences are more useful than a guess based on another person’s wardrobe. Care expectations matter here as well; a gift should suit the person receiving it, including the way they look after their clothes. For a personal purchase or a practical gift, the strongest starting point is the same: warmth, considered alongside the details that make a garment right for its wearer. Familiar proportions, clearly understood care requirements and attention to individual preferences give this foundational part of a wardrobe the consideration it deserves.
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