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NEW CUSTOMERS  - SAVE 15% - USE CODE: NEW2TREKT. EXCLUDES SELECT BRANDS/ITEMS.

Men's Baselayers & Underwear

124 Products

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  • Patagonia's most versatile synthetic baselayer keeps you dry and warm in cool to cold conditions.

    Our Price:
    $34.30
  • Patagonia's most versatile synthetic baselayer keeps you dry and warm in cool to cold conditions - with a 1/4 zipper for ventilation.

    Our Price:
    $41.30
  • Patagonia's most breathable synthetic baselayer keeps you dry and comfortable in cool conditions - with a 1/4 zipper for ventilation.

    Our Price:
    $34.30
  • Patagonia's most breathable synthetic baselayer keeps you dry and comfortable in cool conditions.

    Our Price:
    $31.50
  • Patagonia's stretchiest synthetic baselayer keeps you dry and cool in warm conditions, with 50-UPF sun protection.

    Our Price:
    $20.30
  • Great as a baselayer in cooler conditions, or by itself when it heats up. Smartwool's Microweight Crew is a must have for any outdoorsman.

    Our Price:
    $52.50
  • 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.

    As Low as:
    $60.00
  • 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.

    As Low as:
    $71.25
  • 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.

    As Low as:
    $78.75
  • 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

    As Low as:
    $76.00
  • Nice and warm, the Men's HyFi full zip is going to be a new favorite for trail runs and hikes throughout the cold chilly months. Wear it as a midlayer for ski/snowboard adventures or as a standalone on those more moderate weather days on the trail.

    As Low as:
    $140.00
  • These stay-put stretch briefs are perfect for high-adrenaline and high-mileage activities in the warmest of conditions. Made of the fabled Cap 1 baselayer, the Stretch Briefs wick moisture and provide ample amounts of comfort.

    Our Price:
    $17.50
  • Mountain Hardwear's classic wicking tee shirt is re-engineered and re-designed to provide even more comfort and wicking power.

    As Low as:
    $26.25
  • 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.

    As Low as:
    $36.00
  • 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
  • The Oasis Long Sleeve Crewe is an active base layer made from Bodyfit 200 merino fabric to keep your body at the perfect temperature when you're hiking or exploring the outdoors. Complete with offset shoulder seams to prevent chafing.

    Our Price:
    $72.00
  • These cozy leggings are an active base layer made from 200gm merino fabric for cool conditions. Features include a convenient functioning front fly, smooth flatlock seams to prevent rubbing and a slim fit for prolonged comfort.

    Our Price:
    $72.00
  • This Zip T features a 14" front zipper and a drop tail bottom hem for increased coverage and easier tuckability. Contoured sleeve cuff keeps sleeves in place while flatlock seams eliminate chafing.

    As Low as:
    $66.50
  • Take it easy with these relaxed-fit boxers, which may just be the most comfortable underwear you'll ever wear. They're made from 150gm fabric, Icebreaker's lightwest weight of merino, to ensure an extremely comfortable, breathable fit.

    Our Price:
    $40.00
  • A best-selling baselayer designed to keep you warm and dry when the temperature really plummets.

    Our Price:
    $90.00
  • The Shak Full Zip is an outstanding midlayer or standalone. Made of 100% merino wool, it pulls moisture away from the body and natural odor control keeps you smelling fresh after a long day of adventuring. It's great for technical use and casual nights ou

    Our Price:
    $132.00
  • Stay warm and dry in cool to cold conditions in our warmest and most breathable baselayer.

    Our Price:
    $69.30
  • 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:
    $96.00
  • Patagonia's warmest and most breathable synthetic baselayer keeps you dry and comfortable in cold conditions. Updated for 2012, the new Capilene 4 is lighter and warmer.

    Our Price:
    $99.00
See Trekt Reviews at Bizrate.com