On Sale: Men's Long Underwear from Backcountry.com

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.

Read Reviews

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.

Read Reviews

Available Sizes:S, XL, XXL

ON SALE:

$44.95 (44% off)

Icebreaker BodyFit260 Tech Top - Long-Sleeve - Men's

The Icebreaker Men's BodyFit260 Tech Top features super high quality New Zealand merino wool.

Read Reviews

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

ON SALE:

$79.96 - $109.95 (20% off)

Icebreaker Beast Boxer Brief w/Fly - Men's

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

Read Reviews

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

ON SALE:

$27.97 - $39.95 (30% off)

Under Armour Boxer Short - Men's

The Under Armour Men's Boxer Short keeps you cool and comfortable at work and during your workout.

Read Reviews

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

ON SALE:

$15.95 (20% off)

Under Armour Boxer Jock - Men's

Stay cool and secure right down to your skivvies when you wear the Under Armour Men's Boxer Jock. These boxer briefs give you a snug compression fit for support that won't hinder athletic range of motion.

Read Reviews

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

ON SALE:

$15.95 (20% 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.

Read Reviews

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

ON SALE:

$51.96 - $69.95 (20% off)

Under Armour Short Boxer Jock - Men's

Imagine how good a breathable mesh crotch panel in your boxers would feel when you're sweating bullets on runs, hikes, and workouts.

Read Reviews

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

ON SALE:

$15.95 (20% 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.

Read Reviews

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

DISCONTINUED COLORS

$85.00

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.

Read Reviews

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

ON SALE:

$44.96 - $59.95 (25% 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.

Read Reviews

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

ON SALE:

$69.27 - $98.95 (30% 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.

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

ON SALE:

$47.97 (40% off)

Icebreaker Beast Brief - Men's

Icebreaker's Beast Brief helps you walk the line between keeping your beast caged and under control or letting your beast roam wild.

Read Reviews

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

ON SALE:

$31.46 - $34.95 (10% off)

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.

Read Reviews

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

ON SALE:

$40.46 - $44.95 (10% 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

DISCONTINUED COLORS

$44.95

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.

Read Reviews

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

ON SALE:

$87.96 - $119.95 (20% 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.

Read Reviews

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

ON SALE:

$87.47 - $124.95 (30% off)

Arc'teryx Delta AR Zip Neck Shirt - Men's

Layer the Arc’teryx Men’s Delta AR Zip Neck Shirt over a baselayer, under a vest, under a jacket, or just wear it on its own.

Read Reviews

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

DISCONTINUED COLORS

$118.95

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.

Read Reviews

Available Sizes:S, M, L, XL

ON SALE:

$42.25 (35% 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.

Read Reviews

Available Sizes:M, L, XL, XXL

ON SALE:

$54.97 (45% off)

Patagonia Wool 2 Zip Neck Top - Long-Sleeve - Men's

The Patagonia Men's Wool 2 Zip-Neck base layer doesn't hold the sweaty smells like your old synthetic long underwear did. Plus, the versatile Wool 2 keeps you dry and comfortable when you backpack, cross country ski, rock climb, or hike.

Read Reviews

Available Sizes:XS, S, XL

ON SALE:

$70.40 (12% off)

Ibex Balance Seamless Boxer Short - Men's

Pull on the Ibex Men's Balance Seamless Boxer Short and bring some poise to your nether regions.

Available Sizes:M

ON SALE:

$31.47 (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.

Read Reviews

Available Sizes:S

ON SALE:

$46.72 (45% off)

Burton Bm Tech Polo Top - Men's

The Burton Men’s Bm Tech Polo Top blends the on snow performance of a synthetic base layer with the swanky style of a cotton collar.

Read Reviews

Available Sizes:S, M, L, XL

ON SALE:

$32.48 - $38.97 (50% off)

Patagonia Organic Cotton Boxer - Men's

Patagonia made the Men's Organic Cotton Boxers for everyday comfort. The organic cotton feels smooth and softens over time.

Read Reviews

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

ON SALE:

$25.60 (20% off)

Kavu Wooster Half Zip Shirt - Men's

Pull on the Kavu Men’s Wooster Half Zip Shirt for a fall run, or slip it on under your winter coat for a warm, moisture-wicking under-layer

Available Sizes:S, M, L, XL

ON SALE:

$38.46 (30% off)

SmartWool Microweight Crew Shirt - Long-Sleeve - Men's

Wear the SmartWool Men's Microweight Long-Sleeve Crew Shirt for cool- or warm-weather aerobic activities or as a next-to-skin base layer.

Read Reviews

Available Sizes:XXL

ON SALE:

$41.97 (30% off)

686 Direct Layer Long Underwear Top - Men's

Pull on the 686 Direct Top Layer as your defense against clammy, cold skin while you ride.

Available Sizes:S, XL

ON SALE:

$36.00 (40% off)

686 Tactic Riding Jersey - Long Sleeve - Men's

The 686 Men's Long-Sleeve Tactic Riding Jersey has a polo collar that juices your style, whether you're dropping dank moves in the park or explaining that smell to the cops.

Read Reviews

Available Sizes:S

ON SALE:

$18.02 (60% off)

Clothing

Gear

Accessories

On Sale: Men's Long Underwear

Shop By Brand

My Cart

Gear Questions RSS FeedGear Questions

Email Opt-In

Best Sellers