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Men's Long Underwear

Almost Sold Out

SmartWool Midweight Crew - Men's

Regular: $69.95
Price: $48.97 30% Off!

Only 3 left!

SmartWool Lightweight Zip T-Shirt - Long-Sleeve - Men's

Regular: $74.95
Price: $52.47 30% Off!

Only 1 left!

DC Agate Crew Neck Top - Men's

Regular: $43.95
Price: $13.19 70% Off!

Only 3 left!

Best Deals

DC Onyx 1st Layer Pant - Men's

Regular: $43.95

Price: $13.19 70% Off!

DC Agate Crew Neck Top - Men's

Regular: $43.95

Price: $13.19 70% Off!

Oakley Enclosed Short/Boxer - Men's

Regular: $30.00

Price: $12.00 60% Off!

Men's Lightweight Long Underwear - Tops	Men's Midweight Long Underwear - Tops	Men's Lightweight Long Underwear - Bottoms
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Men's Underwear

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Backcountry.com Merino Zip Tee - Long-Sleeve - Men's

We made our Backcountry.com Men's Merino Long-Sleeve Zip Tee with super-fine New Zealand Merino, flat-locked seams, and a ½ zip chest so you can tackle anything from a 5-day backpacking trip to a run around the neighborhood.

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Available Sizes:S, L, XL, XXL

ON SALE:

$39.95 (43% off)

Backcountry.com Merino Bliss Lightweight Long Underwear Top - Men's

With its soft, naturally odor-resistant 18-micron Merino wool knit and ½ neck zip, our Backcountry.com Men's Merino Bliss Lightweight Top covers you in functional comfort, minus the synthetic funk factor.

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Available Sizes:S, XL, XXL

ON SALE:

$44.95 (44% off)

Icebreaker Beast Boxer Brief w/Fly - Men's

Now you can soothe the savage beast with Icebreaker’s Beast Boxer Brief with fly.

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Available Sizes:S, M, L, XL

ON SALE:

$27.97 - $31.96 (30% off)

Icebreaker BodyFit260 Crew - Long-Sleeve - Men's

The Icebreaker Men's 2-Tone Long-Sleeve BodyFit260 Crew offers some much-needed style in base layer fashion, not to mention it's made of 100% Merino, the best natural fiber for temperature regulation in the world.

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Available Sizes:L, XL, XXL

ON SALE:

$55.97 - $79.95 (30% off)

Backcountry.com Merino Crew Shirt - Long-Sleeve - Men's

Uncompromising in both quality and form, our Backcountry.com Men's Merino Long-Sleeve Crew Shirt offers the superior moisture managing, naturally anti-odor, and comfort of super-fine New Zealand Merino at a price that might make you pee a little.

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Available Sizes:S, XL, XXL

ON SALE:

$34.95 (42% off)

Patagonia Active Classic Boxer - Men's

Stuff your carry-on with a couple pairs of Patagonia Men's Active Classic Boxers, and you're ready for a trip anywhere.

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Available Sizes:S, L, XL

ON SALE:

$25.60 (20% off)

Marmot Midweight Zip Neck Top - Long-Sleeve - Men's

The Marmot Men's Midweight Zip long sleeve shirt covers you in a shaped fit that's easy to layer without accumulating bulk, and the half neck zip dumps heat when the temps rise.

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Available Sizes:S

ON SALE:

$34.99 (30% off)

SmartWool Microweight Boxer Brief - Men's

Wool in the springtime? Yup, the Smartwool Men's Microweight Boxer is 100% merino wool. It might also be the most versatile pair of skivvies you'll ever have the privilege of pulling over your cheeks.

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Available Sizes:M

ON SALE:

$27.97 (30% off)

SmartWool Lightweight Zip T-Shirt - Long-Sleeve - Men's

Wear the SmartWool Men's Lightweight Zip-T long-sleeve shirt for cool-weather aerobic activities or as a next-to-skin base layer.

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Available Sizes:XXL

ON SALE:

$52.47 (30% off)

The Levitation Project NBLP Lightweight Pro Short - Men's

If you disbelieve that recycled water bottles and burned coconut fiber can keep you comfortable, dry, and un-funky, you must grace your loins with the NBLP Lightweight Pro Short from the Levitation Project.

Available Sizes:S, M, L, XL, XXL

ON SALE:

$18.36 (60% off)

DC Otish Bottom - Men's

There are two really cool things about the DC Otish Bottoms. First, they fit like sweatpants. Second, they’re made from 100% Merino wool.

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Available Sizes:S, M, L, XL, XXL

ON SALE:

$47.97 (40% off)

Icebreaker BodyFit200 Oasis Crew - Men's

The Icebreakers Men's BodyFit200 Oasis Crew is a great all-around lightweight base layer made from the ultimate breathable insulation—Merino wool.

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Available Sizes:S, M, L, XL

ON SALE:

$51.96 (20% off)

DC Garvie Crew - Long-Sleeve - Men's

If Marcus Garvey was still kicking it, he’d probably wear the DC Men’s Garvie Long-Sleeve Crew under his three-piece suit. This merino wool base layer keeps you warm, breathable, and odorless while you shred.

Available Sizes:S, M, XL

ON SALE:

$39.98 (50% off)

Icebreaker BodyFit 150 Atlas Top - Long-Sleeve - Men's

Wear the Icebreaker Men's BodyFit150 Atlas T-Shirt for traveling the globe, going for a hike, or hitting up the local climbing gym for a quick bouldering session. This slim-fit, merino wool tee regulates your temperature and wicks sweat.

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Available Sizes:S, M, L, XL, XXL

ON SALE:

$44.96 (25% off)

Sugoi Wallaroo 210 Zip Top - Long-Sleeve - Men's

Cozy merino wool makes the Sugoi Men’s Wallaroo 210 Long-Sleeve Zip Top a base layer to wear for many a bike ride to come.

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Available Sizes:S, M, XL

ON SALE:

$49.98 (50% off)

SmartWool Microweight Zip T-Shirt - Long-Sleeve - Men's

Wear the SmartWool Men's Microweight Zip-T for stop-and-go aerobic activities or as a warm base layer.

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Available Sizes:XL

ON SALE:

$48.97 - $62.96 (30% off)

Icebreaker BodyFit260 Altitude 1/4-Zip Top - Long-Sleeve - Men's

Wear the slim-fit Icebreaker Men's BodyFit260 Altitude Zip Midweight Top as a base layer for extreme high-altitude adventures. Merino wool fabric possesses insulating properties that synthetics just can't touch.

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Available Sizes:S, M, L, XL, XXL

ON SALE:

$87.96 - $98.96 (20% off)

Burton Midweight Pant - Men's

Don’t head up the lifts without the Burton Men's Midweight Pants on your ass. You count on your shells to keep you dry from outside elements, but these puppies keep you dry from the inside.

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Available Sizes:L, XL

ON SALE:

$17.48 (50% off)

Volcom Under Shirt Crew - Short-Sleeve - Men's

Put on the Volcom Men's Under Crew T-Shirt first, and the fuzzy bunny suit second.

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Available Sizes:S, M, L, XL, XXL

ON SALE:

$13.46 (25% off)

Terramar Sonic X Pant - Men's

You won’t be able to run like a hopped up hedgehog, but the Terramar Men’s Sonic X Pant will fend off funk and wick moisture like a video game hero.

Available Sizes:S, L, XL, XXL

Price:

$43.95

Icebreaker Beast Relaxed Boxer w / Fly - Men's

Give your partner in crime a comfortable place to dwell when you pull on the Icebreaker Men’s Beast Relaxed Boxer w / Fly. A supportive, contoured pouch gives your little (or big—no judgement here) critter room to move.

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Available Sizes:S, L, XL

ON SALE:

$31.47 (30% off)

Driza-Bone 3/4 Lightweight Legging - Men's

Your ski underwear can get pretty stinky—especially when you have a weeklong, no-laundry ski vacation. The Driza-Bone ¾ Leggings, however, won’t get stinky at all.

Available Sizes:S, L, XL, XXL

ON SALE:

$34.99 - $48.99 (50% off)

DAKINE Factor 1/4 Zip Top - Long-Sleeve - Men's

Zip up the DAKINE Men’s Factor 1/4 Zip Long-Sleeve Top before you head out for a day on the mountain. This warm Microfleece base layer keeps you toasty, dry, and odor free.

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Available Sizes:S, XL

ON SALE:

$32.97 (40% off)

Spyder Stash Recycled T-Neck Fleece Pullover - Men's

Pull on the Spyder Men’s Recycled T-Neck Fleece Pullover, and head out to your favorite secret powder run or backcountry campsite.

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Available Sizes:S, M, L, XL, XXL

ON SALE:

$54.97 (45% off)

Burton Lightweight Bottom - Men's

Drag yourself out of bed and into the Burton Men’s Lightweight Bottom. The feeling of smooth polyester next to your skin prepares your senses for an early morning on the mountain.

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Available Sizes:XL

ON SALE:

$17.97 (40% off)

DAKINE Apex Crew Top - Long-Sleeve - Men's

When you wear the DAKINE Apex Long-Sleeve Crew Top your base layer is as stylin’ as your outerwear.

Available Sizes:S, XL

ON SALE:

$18.48 - $25.99 (50% off)

Arc'teryx Rho LT Zip Top - Long-Sleeve - Men's

The Arc'teryx Men's Rho LT Zip Neck Top is an ideal foundation for backcountry travelers.

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Available Sizes:S, M

ON SALE:

$69.27 (30% off)

Columbia Omni-Dry Tough Soft Half-Zip Shirt - Long-Sleeve - Men's

From summer backpacking trips to cold days on the mountain, the Columbia Men’s Omni-Dry Tough Soft Half-Zip Long-Sleeve Shirt breathes moisture while retaining body heat to keep your time outdoors enjoyable.

Available Sizes:S, M, L, XL, XXL

ON SALE:

$29.22 (35% off)

Patagonia Wool 2 T-Shirt - Short-Sleeve - Men's

From deep, cold ski days to sun-baked summer afternoons at the crags, the Patagonia Men’s Wool 2 T-Shirt wicks mad moisture and dries in a flash.

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Available Sizes:S, M, L, XL

ON SALE:

$42.25 (35% off)

SmartWool Lightweight Bottom - Men's

Wear the SmartWool Men's Lightweight Bottom for cool-weather aerobic activities or as a next-to-skin base layer.

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Available Sizes:XL

ON SALE:

$58.46 (10% off)

Sierra Designs Ice Ray 1/4 Zip Top - Men's

With the style of your favorite sweater and the performance of your go-to fleece, the Sierra Designs Men’s Ice Ray ¼ Zip Top cuts the chill on any casual or backcountry outing.

Available Sizes:L, XL, XXL

ON SALE:

$31.49 (30% off)

Oakley Enclosed Bottom - Men's

We have no idea why Oakley called this base layer pant the Enclosed Bottom when you’re supposed to wear it outside, but whatever. It works.

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Available Sizes:XL, XXL

ON SALE:

$20.00 (50% off)

Terramar Sonic X Half-Zip Top - Men's

The Terramar Men’s Sonic X Half Zip Top fends off funk with Silver X odor technology so you can stay out on the trail longer without offending those you pass.

Available Sizes:S, M, XL, XXL

Price:

$64.95

Sugoi Midzero Zip Neck - Men's

The Sugoi Men's MidZero Zip Neck provides a tight fit and has a front zipper for optimal ventilation.

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Available Sizes:S, M

ON SALE:

$34.98 - $34.99 (50% off)

The North Face XTC Midweight 1/4-Zip Pullover - Men's

Wear The North Face Men’s XTC Midweight ¼-Zip Pullover alone or under a shell during any of your cold-weather backcountry forays. This base layer features The North Face’s bamboo carbon technology.

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Available Sizes:S, XL, XXL

ON SALE:

$34.96 (30% off)

Spyder First Place Dry W.E.B. Midweight T-Neck

A gusseted zipper collar on the Spyder Men's First Place Dry W.E.B. Midweight T-Neck keeps your body heat in on frigid winter days.

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Available Sizes:S, M, L, XL, XXL

ON SALE:

$46.72 (45% off)

Patagonia Capilene 4 Zip-Neck - Long-Sleeve - Men's

Patagonia made the wicking Men's Capilene 4 Zip-Neck base layer for stop-and-go activities in cold conditions.

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Available Sizes:S, L, XL, XXL

ON SALE:

$59.50 (30% off)

Terramar Sonic X Mock Neck Top - Men's

The Terramar Men’s Sonic X Mock Neck Top fends off funk with Silver X odor technology so you can stay out on the trail longer without offending those you pass.

Available Sizes:S, M

Price:

$64.95

Arc'teryx Rho AR Bottom - Men's

The Men's Arc'teryx Rho Bottom has a tough exterior and soft interior to provide comfort in the mountains without sacrificing durability.

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Available Sizes:XL, XXL

ON SALE:

$59.37 (40% off)

Arc'teryx Rho AR Shirt - Long-Sleeve - Men's

Keep cold weather guessing when you pull on the Arc’teryx Men’s Rho AR Long-Sleeve Shirt. This double-agent base layer also acts as a cozy midlayer when the temperature really drops.

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Available Sizes:M, L, XL

ON SALE:

$87.47 (30% off)

Results 1 to 40 of 107

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