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Thermal Base Layer Bottoms

Find thermal base layer bottoms for the first layer of your outfit. Explore the selection of long underwear bottoms, and compare individual fit and sizing details to choose a pair that works under your outer layers.

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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 itch-free merino wool in eggplant heather for versatile warmth.
(390)
$99.95 $84.99
SALE
What customers like:
Great fit
Perfect weight
Warmth
Non-itchy
Comfortable fabric
$99.95 $84.99
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 lightweight blue merino wool base layer pant offering warmth, softness, and a smooth, high-rise slim fit.
(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 synthetic base layer pant in dark black, perfect for everyday warmth and comfort.
(116)
$54.95 $54.95
SALE
What customers like:
Adds extra warmth
Lightweight
Softness
Good fit
Comfortable
$54.95 $54.95
SALE
Men's L.L.Bean Simple Soft Base Layer, Pants
L.L.Bean Men's L.L.Bean Simple Soft Base Layer, Pants
A lightweight, moisture-wicking synthetic base layer pant in faded sage heather, perfect for everyday warmth.
(86)
$54.95 $54.95
SALE
What customers like:
Great for layering
Provides warmth
Lightweight feel
$54.95 $54.95
SALE
Women's L.L.Bean Heavyweight Base Layer Pants
L.L.Bean Women's L.L.Bean Heavyweight Base Layer Pants
A versatile, moisture-wicking, and quick-drying base layer with a high-rise fit, made from recycled polyester.
(0)
$64.95 $64.95
SALE
$64.95 $64.95
SALE
Men's L.L.Bean Heavyweight Base Layer Pant
L.L.Bean Men's L.L.Bean Heavyweight Base Layer Pant
A heavyweight base layer pant in midnight black, made from recycled polyester, wicks moisture and controls odor.
(0)
$64.95 $64.95
SALE
$64.95 $64.95
SALE
Women's L.L.Bean Midweight Base Layer Pants
L.L.Bean Women's L.L.Bean Midweight Base Layer Pants
A versatile midweight base layer with moisture-wicking, quick-dry fabric made from recycled polyester in Lavender Ice.
(0)
$54.95 $54.95
SALE
$54.95 $54.95
SALE
Men's L.L.Bean Midweight Base Layer Pants
L.L.Bean Men's L.L.Bean Midweight Base Layer Pants
A versatile midweight base layer in pinewood green, made from recycled polyester for warmth and moisture-wicking comfort.
(0)
$54.95 $54.95
SALE
$54.95 $54.95
SALE

Thermal Base Layer Bottoms

Thermal Base Layer Bottoms are the starting point for a thoughtfully layered outfit, the first piece you reach for before adding the rest. Choosing a pair comes down to more than the size on the label: the cut, length and fit should make sense for you and the clothing you plan to wear over them. Think about the pants already in your closet and how much room they leave for a base layer underneath. A closer-cut pair of pants calls for particular attention to the measurements and fit description. As you browse, compare those details rather than assuming every style will fit the same way. The right choice is one that belongs naturally in your layering routine, without making getting dressed feel complicated.

Start with the size chart, then take a closer look at the waistband, leg shape and inseam information provided for each option. Consider where you like a waistband to sit and where you want the hem to fall, especially when putting together your full set of layers. If you’re between sizes, look for style-specific guidance rather than automatically choosing a smaller size simply because these bottoms are a base layer. Your own preferences matter, too: a cut that feels right to one person may not be the cut another reaches for first. Check the care instructions before making a decision, particularly if you prefer a straightforward laundry routine. Those small, practical considerations can help narrow a long list down to the options that make sense for your wardrobe.

Thermal base layer bottoms can also be a thoughtful gift for someone who appreciates useful additions to their clothing drawer. It helps to know more than their usual size: a preferred rise, familiar inseam or favorite style of waistband gives you a more personal starting point. Think of the person who keeps their layers neatly folded together, or the family member who likes having tomorrow’s clothes set out before bed. For them, choosing a gift with their everyday preferences in mind can mean more than choosing something unfamiliar just for the sake of surprise. Whether you’re shopping for yourself or someone close to you, take a moment to compare the available styles with what’s already worn and enjoyed. A well-considered addition starts with the person who will wear it.

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