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.

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Men's Two-Layer Union Suit

A supersoft red union suit with a wool blend for warmth and nonchafing flatlock seams for comfort.

Pros: Soft material Well-made Warmth Comfortable Good fit
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 Cresta Wool Ultralight 150 Pants

An ultralight base layer made of 100% merino wool, perfect for cool-weather sports and odor-resistant.

Pros: Lightweight Warm without being bulky Stylish Durable Comfortable
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 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 Simple Soft Base Layer, Crew

A lightweight, moisture-wicking synthetic base layer in faded sage heather, perfect for everyday warmth and layering.
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 Midweight Base Layer Crew Top

A midweight, moisture-wicking base layer with REPREVE® recycled polyester, offering warmth and odor resistance in midnight black.
Men's L.L.Bean Midweight Base Layer Pants

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

A heavyweight base layer pant in midnight black, made from recycled polyester, wicks moisture and controls odor.
Men's L.L.Bean Midweight Base Layer Crew Top, 1/4 Zip

A versatile midweight base layer with REPREVE® recycled polyester, featuring thumb holes and anti-microbial finish.
Men's Cresta Wool Ultralight 150 Pant, Stripe
Price was from: $89.95 now: $75.99

A lightweight, itch-free 100% merino wool base layer pant in regatta blue and glacier blue for cold-weather sports.
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 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
Price was from: $54.95 now: $45.99

A lightweight red silk crewneck base layer offering strong warmth and comfort without bulk.

Pros: Fast drying Provides warmth Feels like real silk Comfortable fit Easy to clean
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 Cresta Ultralight 150 Crew Top

An alloy gray, 100% merino wool crew top offering lightweight warmth and comfort for all-season activities.

Pros: Soft material Warmth Good fit Comfortable Versatility
Men's Cresta Ultralight 150 Crew Top, Stripe
Price was from: $89.95 now: $75.99

A remarkably soft and warm striped crew top made of 100% merino wool with thumbhole cuffs.
Men's Cresta Wool Ultralight 150 Turtleneck
Price was from: $99.95 now: $84.99

An alloy gray, 100% merino wool turtleneck that wicks moisture, resists odors, and features thumbhole cuffs.
Men's Cresta Ultralight 150 Hoodie, Stripe
Price was from: $99.95 now: $84.99

A form-fitting, 100% merino wool hoodie in regatta blue, perfect as a base layer for winter sports.
Men's Cresta Ultralight 150 Turtleneck, Stripe
Price was from: $99.95 now: $84.99

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 Baselayer Hoodie

A midnight black, eco-friendly baselayer hoodie with moisture-wicking fabric and anti-microbial finish for outdoor adventures.

Mens Athletic Long Underwear

When it comes to staying comfortable and performing your best during outdoor activities, the right base layer can make all the difference. Men’s athletic long underwear—sometimes called long johns or baselayers—are thoughtfully designed to support an active lifestyle, whether you’re heading out for an early morning run, gearing up for a long hike, or simply enjoying time outside with family. These layers are engineered to trap warmth close to the body, wick away sweat, and reduce chafing, helping you stay dry and comfortable as you move. The best long underwear for men offers a blend of technical performance and everyday comfort, making it a smart addition to any wardrobe for those who love to get outside, rain or shine. Many outdoor enthusiasts find that athletic & long johns are just as useful for cool summer mornings as they are for brisk autumn hikes or unexpected temperature drops, providing reliable comfort that adapts to the changing seasons.

Choosing the right men’s athletic long underwear starts with understanding your needs and the activities you enjoy most. For high-intensity pursuits like trail running, mountain biking, or fast-paced hiking, lightweight synthetic fabrics excel at moving moisture away from the skin, helping to regulate body temperature and minimize discomfort. Merino wool options are a favorite among those who appreciate natural warmth and odor resistance, making them a versatile pick for everything from multi-day camping trips to cool-weather workouts. Fit is also key: look for long johns with a snug, athletic cut that moves with you and won’t bunch under outer layers. Thoughtful features like flatlock seams, gusseted construction, and stretch fabrics add to overall comfort, reducing friction and allowing for a full range of motion. Many men find that a good pair of long underwear quickly becomes a go-to staple, not only for outdoor adventures but also for everyday use—perfect for layering under work clothes on chilly mornings or relaxing at home after a busy day.

Men’s athletic long underwear also makes a thoughtful gift for anyone who values time outside—whether it’s a partner who loves early morning walks, a friend training for a fall marathon, or a family member who enjoys camping and exploring new trails. These layers are built to last, offering durable construction and easy care that stands up to repeated wear and washing. If you’re looking to round out your gear or surprise someone with a practical, much-appreciated gift, consider classic options like l.l. bean long johns for their trusted quality and timeless style. And if you’re preparing for colder adventures or want to explore more options, you’ll find a wide selection of dependable layers at our Cold Weather Long Underwear page. No matter where your next adventure takes you—whether it’s a local trail, a backyard campout, or a favorite fishing spot—reliable base layers help ensure you stay comfortable, dry, and ready to enjoy the restorative power of the outdoors.