Men's Insulated Underwear

Gear up for the great outdoors with men's insulated underwear that combines comfort and durability in a timeless style. Designed to keep you warm during chilly adventures, these essentials offer lasting value and versatility for any outdoor enthusiast. Whether you're hiking through frosty trails or enjoying a brisk morning run, our selection ensures you stay cozy and comfortable. Embrace the outdoors confidently, knowing your base layer is crafted to withstand the elements while providing the ease of movement you need. Explore options that cater to various preferences and make every outdoor experience more enjoyable.

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298 Items

Men's L.L.Bean Fleece Baselayer Pants
Price was from: $44.95 now: $34.99

A warm and cozy baselayer made from recycled polyester, perfect for skiing or lounging by the fire.

Pros: Cozy Warm Comfortable Thick Soft
Men's L.L.Bean Midweight Base Layer Pants
Price was from: $49.95 now: $29.99

A blue synthetic base layer pant with moisture-wicking, quick-drying, and odor-resistant properties for all-day comfort.
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 Cresta Midweight 250 Pants

A versatile base layer made of itch-free merino wool, wicking sweat and resisting odor in dark black.

Pros: Great color Versatile use Soft and lightweight Excellent warmth Comfortable fit
Men's Double-Layer Underwear, Pants
Price was from: $49.95 now: $24.99

A gray wool-blend thermal pant featuring double-layer warmth for men.
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 Maine Guide Wool Pants with PrimaLoft

A pair of insulated wool blend pants with PrimaLoft Silver, perfect for hunting in cold weather.

Pros: Not scratchy Good fit Comfortable Excellent warmth
Men's Maine Guide Wool Pants with PrimaLoft, Camouflage

A pair of insulated camouflage wool blend pants with PrimaLoft Silver, designed for warmth and durability.

Pros: High quality Attractive print Room for base layer Good fit Excellent warmth
Men's Cresta Wool Ultralight 150 Base Layer, Hoodie

A form-fitting, alloy gray Merino wool hoodie that wicks moisture and resists odors for all-season comfort.

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

A lightweight, moisture-wicking synthetic base layer pant in dark black heather, perfect for everyday warmth.

Pros: Great for layering Provides warmth Lightweight feel
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 L.L.Bean Midweight Base Layer Pants

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

A heavyweight, moisture-wicking base layer with recycled polyester, anti-microbial finish, and thumb holes in kelp green camo.
Men's L.L.Bean Heavyweight Base Layer Pant

A heavyweight base layer pant in midnight black, made from recycled polyester with moisture-wicking properties.
Men's Cresta Wool Ultralight 150 Pant, Stripe

A slim-fit, itch-free 100% merino wool base layer pant in regatta blue for cold-weather activities.
Men's L.L.Bean Heavyweight Base Layer Pant, Print

A heavyweight base layer pant in kelp green camo, made from recycled polyester for warmth and moisture-wicking.
Men's Cresta Wool Midweight 250 Crew Top

A versatile merino wool base layer 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 black silk base layer offering warmth and comfort without added bulk.

Pros: Great fit Quality Warmth Comfortable Versatile for weather
Men's Silk Underwear, Crewneck

A strong, lightweight dark flint gray silk crewneck, perfect as a first layer against the cold.

Pros: Durable fabric Great for travel Feels like real silk Comfortable fit Excellent warmth
Men's Double-Layer Underwear, Crewneck
Price was from: $49.95 now: $24.99

A gray wool-blend crewneck sweatshirt featuring double-layer thermal construction for superior warmth.
Men's Cresta Midweight 250 Quarter-Zip Top

A midweight merino wool quarter-zip top in saddle heather, designed to wick sweat and resist odor.

Pros: Keeps you warm Excellent base layer Comfort Durability Versatility
Men's Cresta Ultralight 150 Crew Top

An alloy gray, extra-large crew top made of 100% merino wool, perfect as a lightweight base layer.

Pros: Soft material Warmth Good fit Comfortable Versatility
Men's Cresta Ultralight 150 Crew Top, Stripe

A remarkably soft and warm striped crew top made of 100% merino wool, perfect for any season.
Men's L.L.Bean Simple Soft Base Layer, Crew

A lightweight, moisture-wicking synthetic base layer crewneck in faded sage heather, perfect for everyday warmth.

Men's Insulated Underwear

When the air turns crisp and the days grow shorter, having the right layers can make all the difference between a day spent shivering and a day spent enjoying every moment outdoors. Men’s insulated underwear is an essential foundation for anyone who refuses to let cold weather slow them down, whether you’re heading out for a brisk morning walk, stacking firewood at the cabin, or planning a weekend of hiking, skiing, or ice fishing. These thoughtfully designed layers are all about warmth, comfort, and lasting value—crafted to keep you feeling just right, no matter how low the temperature dips. With soft, flexible materials that move with you, insulated underwear fits smoothly under your favorite pants and jeans, delivering reliable warmth without adding bulk or restricting movement. It’s the kind of gear you’ll reach for as soon as the forecast hints at frost, and it’s just as handy for chilly commutes as it is for late-season camping trips or cheering from the sidelines at a fall football game.

Insulated underwear makes a practical and thoughtful gift for anyone who loves to spend time outside, or for those who work and play in all kinds of weather. It’s a great choice for dads who coach youth sports, friends who never miss a morning run, or family members who enjoy winter walks with the dog. Even if you’re just looking to make winter errands or outdoor chores more comfortable, these base layers are a smart investment in warmth and well-being. Many styles are designed for easy layering, with flat seams and stretch fabrics that stay comfortable all day long. Moisture-wicking technology helps keep you dry when you’re active, while advanced insulation traps body heat where you need it most. Whether you’re gearing up for the first frosty mornings of fall or preparing for the deep cold of winter, insulated underwear helps you stay outside longer and enjoy every season to the fullest.

Pairing insulated underwear with other cold-weather essentials can help you build a versatile, weather-ready wardrobe that stands up to whatever the season brings. For even more protection on the coldest days, consider adding a pair of Men's Insulated Winter Pants to your lineup—ideal for layering over your base and mid-layers when temperatures really drop. With the right combination of quality layers, you’ll be set for everything from early morning chores to weekend adventures in the snow. As August winds down and you start to think ahead to cooler days, now is the perfect time to get ready for the season ahead with reliable, comfortable insulated underwear that’s built to last for years of outdoor memories.