Men's Clothing > Fleece & Base Layers

These next-to-skin, body-fitting microweight boxer briefs are nonrestrictive and great for warm- or cool-weather activities! SmartWool® jersey-knit, fine merino wool helps maintain a comfortable temperature whether the day is hot, cold or in between SmartWool items are guaranteed not to itch and can be repeatedly washed and dried without shrinking...

The Microweight's lightness makes it perfect for any warm-weather aerobic activity, either alone or as an undergarment. Couple this lightness with the most efficient moisture management material on the market and you get a layer that keeps you dry. 100% wool jersey knit

The SmartWool Lightwight Bottom will knock your socks off with its comfortable elastic waistband, flat seams and custom fit. Smartwool's most versatile fabric is in the SmartWool Lightweight Bottom, used for moderate to high performance activities in a variety of temperatures. Ideal by itself in mild condtions, great as a...

Built with SmartWool's Next-To-Skin fabric, the SmartWool NTS Lightweight Crew for Men is the ideal way to start your layering system when you need four-season versatility and love cool weather activities. Worn alone or layered up, the NTS Microweight Crew is moisture wicking, temperature regulating and odor resistant, and features...

The body-fitting, long-sleeve NTS Microweight Crew for men is great for warm or cool weather activities. Wear it alone or as a base layer. Jersey-knit, fine merino wool helps maintain a comfortable temperature whether the day is hot, cold or in between SmartWool items are guaranteed not to itch and...

SmartWool's heaviest next-to-skin option, the Midweight Zip T offers excellent moisture management, zip-T ventilation, and next-to-skin softness. Made from 100% SmartWool jersey knit for itch-free softness Zip-T (10-in. zipper) with chin guard to prevent chafing Shoulder panels eliminate top shoulder seams for layering comfort Flatlock seams for nonchafing comfort SmartWool...

Featuring the world's most efficient moisture management system, the Smartwool NTS Midweight Zip T for Men offers next to skin softness and zip-neck ventilation. Worn alone or layered up, the NTS Midweight Zip T is a technical midlayer ideal for the days when the temps are really low. 250gm/m2 Merino...

With twelve inch lockdown zipper and zipper garage, the SmartWool Sport NTS Zip Tee for men gives easy venting and stylish soft next-to-skin comfort. The lightweight rib fabric with athletic body fit and flatlock seams is the perfect cool weather training wear. Zip-T collar w/12" lockdown zipper provides easy donning...

Great for cool-weather running or as a component of your winter layering system, SmartWool's Lightweight Crew combines the comfort of wool with exceptionally easy care - itchless wool wicks quicker, washes easier, and smells better in the long haul than synthetics. Wear it as a baselayer for warmth in cold...

The versatile Microweight T-Shirt features SmartWool's soft merino wool fabric, which pulls sweat vapors away from your skin to keep you dry and comfortable. Wear this SmartWool short-sleeve shirt by itself on a warm-weather trail run or as a base layer underneath a fleece and a ski jacket. Merino wool...

These lightweight boot top bottoms from Smartwool look light and feel light and they don't overheat you while layering through the winter. The perfect length for tall boots during the winter or for staying out of your alpine boots while adventuring through the snow. Smartwool Boot Top Bottoms wick moisture...

The Smartwool Midweight Solid Crew is part of their heaviest line, and is perfect for forays into alpine environments where temperatures -- and schedules -- fluctuate. Comfortable next to the skin, and offering the world’s most efficient moisture-management system. Because Smartwool fibers wick moisture away while it's still in a...

Perfect for supplementing your baselayer or adding in beneath a parka, SmartWool's Midweight Zip T is a durable, heat-trapping addition to your cold-weather collection. Designed for fast-paced activities in cold climates, a thick layer of midweight Merino wool knit keeps you warm while a deep, 10-inch zipper provides ventilation options....

Built with SmartWool's lightest layering fabric, the SmartWool NTS Microweight Tee for Men is the ideal way to start your layering system and stands alone for warm weather biking and running. Moisture wicking, temperature regulating and odor resistant, the NTS Microweight Tee features flatlock seam construction for all-day chafe-free comfort....

Wear the SmartWool Men’s NTS Lightweight Boxers during your next backpacking trip or to the climbing crag. These NTS (next to skin) boxers feel soft and smooth—not what you’d expect from wool. But then, merino wool is nothing like that itchy stuff your grandma’s Scandinavian sweater is made of. Merino...

Wear the Lightweight Zip-T from SmartWool when you need a soft, breathable base layer for aerobic-level output in all weather. Worn alone, the Zip T helps regulate your temperature and keeps you dry through both cold and warm conditions. As a baselayer, it offers warmth without overheating. SmartWool jersey knit...

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. SmartWool's porous natural fibers move moisture while it is still in vapor form before it has a chance to condense on your skin; you stay drier and more comfortable throughout...

Wear the SmartWool Men's Midweight Bottom for stop-and-go aerobic activities or as an insulating base layer. This warm pant is ideal for situations where the weather and temperature fluctuate, like in alpine environments. SmartWool's porous natural fibers move moisture in vapor form, creating a dry layer of air around your...

SmartWool Midweight Bottoms will knock your socks off with comfort and warmth, covered elastic waistband, flat seams, and custom fit. SmartWool Midweight Bottoms, SmartWool's heaviest line, Midweight, is perfect for forays into alpine environments where temperatures and schedules fluctuate. Comfortable next to the skin offering the world's most efficient moisture-management...

SmartWool Midweight Crew Top is comfortable next to skin and offers the world's most efficient moisture-management system Our heaviest line, Midweight, is perfect for forays into alpine environments where temperatures -- and schedules -- fluctuate. Comfortable next to the skin, and offering the world's most efficient moisture-management system. Features Crew...

These next-to-skin, body-fitting microweight long underwear bottoms are great for warm or cool weather activities SmartWool® jersey-knit, fine merino wool helps maintain a comfortable temperature whether the day is hot, cold or in between SmartWool items are guaranteed not to itch and can be repeatedly washed and dried without shrinking...

Wear the SmartWool Men's Microweight Zip-T for stop-and-go aerobic activities or as a warm base layer. SmartWool's porous natural fibers move moisture while it's still in vapor form, so you remain dry and comfortable throughout your alpine foray. SmartWool fiber is highly adaptable to a broad range of conditions. It...

When you head out for an epic powder day, three-pitch ice climb, or a backcountry snowshoe tour, the Smartwool Men’s Midweight ¼-Zip Top is the perfect way to start your layering. Made from soft, stretchy, odor-resistant merino wool, this zip shirt wicks moisture and dries just as quickly as your...

In the coldest winter months, wear the Smartwool Men's Midweight Crew under your fleece jacket and waterproof shell. Thick, soft merino wool fibers manage moisture so you stay dry and warm while you rack up runs. Smartwool infused the fabric with an antimicrobial treatment that fights odors, so you can...

The SmartWool Midweight Crew top offers natural stretch and breathability for stop-and-go activities in fluctuating temperatures. Jersey-knit merino wool maintains your comfort whether the climate is warm, cold or in between Shoulder panels eliminate top shoulder seams and reduce chafing; set-in sleeves increase overall comfort Flatlock side seams are soft,...