Men's Thermal Base Layers

Gear up for cooler adventures with men's thermal base layers that offer the perfect blend of warmth and comfort. These essentials are crafted to keep you cozy during outdoor activities, whether you're hiking through frosty trails or enjoying a brisk morning run. Designed with durability and lasting value in mind, thermal base layers provide the versatility needed to transition seamlessly from active pursuits to everyday wear. Embrace the chill with confidence, knowing you're equipped with reliable layers that make every outdoor experience more enjoyable.

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Men's Two-Layer Union Suit

A supersoft, charcoal union suit with a wool blend for warmth and nonchafing seams for comfort.

Pros: Functional Fits well Well-made Warmth Comfortable
Men's Signature Waffle Crew
Price was from: $89 now: $74.99

A slim-fitting, allspice thermal crew made from 100% breathable waffle-knit cotton for cooler weather.

Pros: High quality Great color Warmth Good fit Comfortable waffle knit
Men's L.L.Bean Midweight Base Layer Pants
Price was from: $49.95 now: $39.99

A blue synthetic base layer pant with moisture-wicking, quick-drying, and odor-resistant properties for all-day comfort.
Men's Cresta Wool Midweight 250 Crew Top

A dark black merino wool crew top that wicks sweat, resists odor, and features thumbhole cuffs.

Pros: Great fit Comfortable feel Durable material Soft fabric Excellent warmth
Men's Silk Underwear, Pants

A strong, lightweight pair of black silk pants offering warmth and comfort without added bulk.

Pros: Great fit Warmth Comfortable Well made Versatile for weather
Men's Cresta Midweight 250 Pants

A versatile base layer made of dark black, itch-free merino wool that wicks sweat and resists odor.

Pros: Odor-resistant Great color Versatile use Excellent warmth Comfortable fit
Men's Silk Underwear, Crewneck

A lightweight, dark flint gray crewneck made from 100% silk, perfect as a warm base layer.

Pros: High fabric quality Durable material Great for travel Comfortable fit Excellent warmth
Men's Double-Layer Underwear, Pants
Price was from: $49.95 now: $39.99

A gray wool-blend thermal pant featuring double-layer warmth for men.
Men's Double-Layer Underwear, Crewneck
Price was from: $49.95 now: $39.99

A gray wool-blend crewneck sweatshirt featuring double-layer thermal construction for superior warmth.
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.

Pros: Keeps you warm Excellent base layer Comfort Durability Versatility
Men's L.L.Bean Fleece Baselayer Pants
Price was from: $44.95 now: $34.99

A warm, cadet blue fleece baselayer made from recycled polyester, perfect for skiing or lounging.

Pros: Cozy Warm Comfortable Thick Soft
Men's Cresta Ultralight 150 Crew Top

An alloy gray, extra-large base layer made of 100% merino wool, offering warmth and comfort year-round.

Pros: Soft material Warmth Good fit Comfortable Versatility
Men's Cresta Wool Ultralight 150 Pants

An ultralight base layer made from 100% merino wool, offering warmth and odor resistance in alloy gray.

Pros: Lightweight Warm without being bulky Stylish Durable Comfortable
Men's Cresta Wool Ultralight 150 Base Layer, Hoodie

An alloy gray, 100% Merino wool hoodie base layer that wicks moisture, resists odors, and fits snugly.

Pros: Soft and fleecy interior Ideal for winter sports Warm and comfortable Good fit Fashionable and supportive
Men's L.L.Bean Simple Soft Base Layer, Pants

A lightweight, moisture-wicking base layer in faded sage heather, made from 94% polyester and 6% spandex.

Pros: Great for layering Provides warmth Lightweight feel
Men's Cresta Ultralight 150 Crew Top, Stripe

A remarkably soft and warm striped crew top made of 100% merino wool with thumbhole cuffs.
Men's Cresta Ultralight 150 Hoodie, Stripe

A form-fitting, 100% merino wool hoodie in regatta blue, perfect as a base layer for winter sports.
Men's L.L.Bean Heavyweight Baselayer Hoodie

A midnight black hoodie made from recycled polyester blend, offering warmth, moisture-wicking, and odor control.
Men's L.L.Bean Heavyweight Base Layer Crew Top, Print

A heavyweight, moisture-wicking, and quick-drying base layer with anti-microbial finish in kelp green camo.
Men's L.L.Bean Lightweight Crew Base Layer, Long Sleeve
Price was from: $39.95 now: $29.99

A lightweight black synthetic crew with moisture-wicking, quick-dry, and odor-resistant properties for active comfort.
Men's L.L.Bean Midweight Base Layer Pants

A versatile midweight base layer in midnight black, made from recycled polyester for warmth and quick-drying comfort.
Men's L.L.Bean Heavyweight Base Layer Crew Top

A heavyweight, moisture-wicking base layer with recycled polyester, thumb holes, and anti-microbial finish in midnight black.
Men's Cresta Ultralight 150 Turtleneck, Stripe

A lightweight, itch-free 100% merino wool turtleneck in regatta blue, perfect as a base layer for winter sports.
Men's L.L.Bean Heavyweight Base Layer Hoodie, Print

A heavyweight base layer hoodie in kelp green camo, made from recycled polyester, wicks moisture and controls odor.

Men's Thermal Base Layers

When you’re gearing up for crisp mornings on the trail, chilly evenings by the campfire, or even just a brisk walk with the dog as the seasons start to shift, men’s thermal base layers are an essential part of staying comfortable outdoors. These versatile pieces are designed to help you enjoy every minute outside, no matter how unpredictable the weather gets. Crafted from materials that balance warmth and breathability, thermal base layers are made to trap heat close to your body while wicking away moisture, keeping you dry and cozy whether you’re hiking up a windswept ridge or layering up for an afternoon of backyard chores. They slide easily under your favorite shirts, fleeces, or jackets, making them a smart choice for anyone who likes to be prepared for changing conditions—think early-morning anglers, fall campers, or anyone who spends time working or playing outside as the temperature dips.

Thermal base layers also make a thoughtful gift for the outdoor enthusiasts in your life, or for anyone who enjoys winter sports, travel, or simply appreciates the comfort of well-made clothing. They’re a reliable companion on family ski trips, autumn hunting weekends, or even just for tackling the daily commute when the air turns brisk. One of the great things about these base layers is their timeless appeal—built to last season after season, they become a go-to that’s always ready when the first cool breeze arrives. Whether you’re layering up for a day in the woods or just want an extra layer of warmth for everyday adventures, these pieces offer lasting value and comfort. Their classic, easy-to-wear styles fit right in with any wardrobe, and their durable construction means they’ll be there for countless outings, year after year.

As you browse our selection, you’ll notice that the right base layer can make all the difference in how you experience the outdoors. Look for features like flatlock seams for chafe-free comfort, stretch that moves with you, and soft fabrics that feel great next to your skin. Many styles are designed to be easy to care for, so you can toss them in the wash and have them ready for your next adventure. While it may be the height of summer now, it’s never too early to prepare for cooler days ahead. Stocking up on men’s thermal base layers now means you’ll be ready for that first crisp morning, whether you’re heading out for a hike, planning a weekend getaway, or just savoring the simple pleasure of a walk in the changing leaves. For even more options to outfit your whole crew, take a look at our full selection of Adult Base Layers and find the right fit for every adventure.