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Men's Baselayers & Underwear

150 Products

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  • The ultimate foundation for smart layering is the SmartWool boxer brief for men. It features a smooth elastic waistband and internal flatlock seams for exceptional smoothness and comfort.

    Our Price:
    $48.00
  • Smartwool's Microweight bottom has a great weight, sharp looking design and fits like a dream. The Men's Microweight Bottom takes the term long underwear to a whole other level.

    Our Price:
    $75.00
  • Designed to be worn for cold weather aerobic activities, this is one of the hardest working baselayer tops on the market. Offering the Merino wool breathability, it's an ideal top for winter running or Nordic/skate skiing.

    Our Price:
    $72.00
  • The perfect all around underwear is Smartwool's Lightweight Boxer Brief. Made from Merino wool, it packs all those excellent attributes you love in their socks. With a super cozy fit, you're going to fall in love.

    Our Price:
    $52.00
  • Smartwool's warmest baselayer just got a little more refined with an improved fit, chaf-free seam construction and panels that offer more comfort with a pack. The perfect baslayer crew just got even better.

    Our Price:
    $95.00
  • The Midweight Zip T is a perfect baselayer for cold weather adventures. Made of outstanding merino wool, you're going to love the moisture wicking properties and antimicrobial fibers. Soft on skin, you're dream baselayer has finally arrived.

    Our Price:
    $105.00
  • The perfect long underwear that will keep you warm when you need it the most. Just remember, these aren't your daddy's long john's

    Our Price:
    $95.00
  • The simple, yet technically advanced, Men's Peachskins Crewneck is extremely light and comfy on the body. With moisture wicking properties to pull sweat away from the core, you'll love the dry cozy feel of this crewneck baselayer.

    Our Price:
    $31.50
  • Thin yet effective, Columbia's midweight baselayer is perfect for skiing or cold-weather hiking. A 1/2 zipper allows for easy venting, helping you avoid the hassle of shedding an entire layer.

    Our Price:
    $24.00
  • A year-round, next-to-skin baselayer made with 100% Merino Wool; designed for wear under your shell pants or alone as loungewear.

    Our Price:
    $70.00
  • A year-round, next-to-skin baselayer made with 100% Merino Wool; perfect for cool days when summer starts to turn into fall, and a heat-venting zipper keeps you cool when you warm up.

    As Low as:
    $51.00
  • Patagonia's most breathable synthetic baselayer keeps you dry and comfortable in cool conditions.

    Our Price:
    $27.00
  • UA's fabric HeatGear wears like a second skin so you get the same powerful compression, plus extreme comfort for all-day wear. Designed with moisture management, you'll be sure to stay comfortable and cool throughout your activity.

    Our Price:
    $24.99
  • Stay comfortable and dry in cool to warm conditions in Patagonia's fastest drying and highly breathable baselayer with 20-UPF sun protection.

    As Low as:
    $34.30
  • Forget old boxer briefs that bunch up, wear out, or lose shape. The Original UA Boxerjock stretches, recovers, stays put, wicks sweat, keeps you cool, and kills odors.

    Our Price:
    $20.00
  • Designed with the team player in mind, this short sleeve T-shirt uses UA Tech fabric to provide cool, dry performance and superior comfort. On-field or off, get the performance you demand when you're at the height of activity.

    Our Price:
    $22.99
  • This latest UA fabric wears like a second skin so you get the same powerful compression, plus extreme comfort for all-day wear. Designed to pull moisture away from the core, it ensures that you'll stay cool and comfortable.

    Our Price:
    $24.99
  • Designed with the team player in mind, this long sleeve T-shirt uses UA Tech fabric to provide cool, dry performance and superior comfort. On-field or off, get the performance you demand when you're at the height of activity.

    Our Price:
    $27.99
  • Stay warm and dry in cool to cold conditions in our warmest and most breathable baselayer.

    Our Price:
    $99.00
  • SL520 - Designed to be worn for cool weather aerobic activities, this is one of the hardest working baselayer tops on the market offering the unique combination of Merino breathability with a windproof 1CFM rating.

    Our Price:
    $120.00
  • Patagonia's tried-and-true printed silkweight baselayer fabric in a boxer silhouette for all-day, next-to-skin comfort.

    Our Price:
    $30.00
  • The Men's Stretch Thermal Tights are an essential baselayer for the coldest winter months. With flat-lock seams to eliminate chafe, the Thermal Tights are sure to be one of the most comfortable baselayers you own.

    Our Price:
    $32.00
  • Extremely warm and cozy, the La Montana Bottoms are made of a soft fleece material that feels like heaven on skin. Wear them skiing/snowboarding or throw them on as standalones when the nights get chilly.

    Our Price:
    $58.50
  • It's no secret that plenty of guys are rocking compression shorts under their board shorts. UA went a step further and added an interface so these compression shorts will attach to your UA board shorts and won't ride up or get pulled down.

    Our Price:
    $27.99
See Trekt Reviews at Bizrate.com