Mens Athletic Long Underwear

Gear up for your next outdoor adventure with men's athletic long underwear, designed to keep you comfortable and supported through every activity. Whether you're hitting the trails or enjoying a brisk morning run, these versatile essentials are crafted to provide warmth and ease of movement. With a focus on quality and lasting value, our selection ensures that you stay prepared for whatever the day brings. Embrace the outdoors with confidence, knowing that your base layer is as dependable as it is comfortable.

Sort by:

Filter & Sort

298 Items

Men's Cresta Wool Midweight 250 Crew Top

A midweight merino wool crew top in dark black that wicks sweat, resists odor, and keeps you warm.

Pros: Perfect fit Soft and comfortable Durable fabric Available in big and tall sizes Great warmth
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 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 Double-Layer Underwear, Pants
Price was from: $49.95 now: $24.99

A blue wool-blend thermal pant featuring a double-layer design for superior warmth and comfort.
Men's Cresta Wool Ultralight 150 Pants

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

Pros: Stylish design Lightweight feel Durable material Warm without bulk Comfortable fit
Men's L.L.Bean Simple Soft Base Layer, Pants

A lightweight, moisture-wicking base layer pant in dark black heather, made from a polyester-spandex blend.

Pros: Ideal for layering Provides warmth Lightweight feel
Men's Cresta Wool Ultralight 150 Base Layer, Hoodie

An ultralight, alloy gray Merino wool hoodie that wicks moisture, resists odors, and fits comfortably under helmets.

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, Crew

A lightweight, moisture-wicking synthetic base layer crewneck in faded sage heather, perfect for everyday warmth.
Men's L.L.Bean Heavyweight Base Layer Crew Top

A heavyweight, moisture-wicking base layer made from recycled polyester with thumb holes and anti-microbial finish.
Men's Cresta Wool Ultralight 150 Pant, Stripe

A slim-fit merino wool base layer pant in regatta blue, perfect for cold-weather sports.
Men's L.L.Bean Midweight Base Layer Pants

A versatile midweight base layer made from recycled polyester, offering moisture-wicking and odor resistance in carbon navy.
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 L.L.Bean Heavyweight Base Layer Pant

A versatile midnight black heavyweight base layer pant made from recycled polyester, perfect for outdoor adventures.
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 Silk Underwear, Pants

A lightweight, solid red silk base layer pant offering warmth and comfort without bulk.
Men's Silk Underwear, Crewneck

A lightweight black silk crewneck providing strong, comfortable warmth as a perfect base layer in cold weather.

Pros: Durable Comfortable Warm Great for travel Feels like real silk
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 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 Cresta Ultralight 150 Crew Top

An alloy gray, 100% merino wool crew top offering lightweight warmth and comfort with thumbhole cuffs.

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 from 100% merino wool, perfect for any season.
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 base layer with recycled polyester, anti-microbial finish, and thumb holes in kelp green camo.
Men's L.L.Bean Midweight Base Layer Crew Top

A midweight, moisture-wicking crew top made from recycled polyester with anti-odor treatment and thumb holes.
Men's L.L.Bean Heavyweight Base Layer Hoodie, Print

A heavyweight base layer hoodie in kelp green camo, made from recycled polyester and elastane.

Mens Athletic Long Underwear

When it comes to gearing up for active days in cooler weather, men’s athletic long underwear stands out as an essential base layer. Whether you’re heading out for a brisk morning hike, gearing up for a late-season camping trip, or simply looking for added comfort during a chilly jog, a reliable pair of long underwear can make all the difference. The right base layer helps regulate your body temperature, wicks away moisture, and keeps you comfortable through changing conditions—whether you’re pushing your limits on the trail or enjoying a leisurely walk with the dog. Many folks find themselves reaching for these layers not just for outdoor adventures, but also for everyday warmth—think raking leaves on a crisp fall afternoon or cheering from the sidelines at a weekend soccer game. With the transition from summer to autumn in full swing, it’s the perfect time to think ahead and make sure your cold-weather gear is up to the challenge.

Selecting men’s athletic long underwear is all about finding that balance of comfort, durability, and versatility. Look for materials that feel soft next to your skin and move with you, offering just the right amount of stretch without ever feeling restrictive. Breathable fabrics that manage moisture are key, especially if you’re active outdoors or layering up for unpredictable weather. Flatlock seams and tagless designs can help prevent chafing, making these base layers a welcome companion for everything from early morning runs to weekend hikes in the hills. If you’re shopping for a loved one, athletic long underwear makes a practical and thoughtful gift—one that shows you care about their comfort and enjoyment, whether they’re tackling a new trail, embarking on a winter road trip, or simply relaxing by the fire after a day outside. And if you’re outfitting the whole family, you’ll find that there are great options for everyone, including Womens Long Underwear Tops designed with the same attention to comfort and quality.

Incorporating men’s athletic long underwear into your layering system can help you stay outside longer, no matter the forecast. These layers are designed to be easy to wear, easy to care for, and ready for whatever the day brings—whether that’s a spontaneous leaf-peeping drive, an afternoon spent splitting firewood, or a chilly morning commute. Their timeless design means they pair effortlessly with your favorite outdoor styles, from rugged flannels to insulated jackets, offering warmth without bulk and versatility that lasts season after season. When the temperature drops and the days grow shorter, having a dependable set of long underwear within reach can turn any day into a good day to get outside. With quality construction and thoughtful details, men’s athletic long underwear is a staple you’ll come back to year after year, ready to keep you comfortable as you make the most of every moment outdoors.