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

Men's Baselayers & Underwear

96 Products

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

    Our Price:
    $29.40
  • Patagonia's most breathable synthetic baselayer keeps you dry and comfortable in cool conditions.

    Our Price:
    $27.00
  • Patagonia's stretchiest synthetic baselayer keeps you dry and cool in warm conditions, with 50-UPF sun protection.

    Our Price:
    $17.40
  • 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:
    $57.00
  • 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.

    As Low as:
    $52.50
  • 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:
    $66.50
  • 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:
    $100.00
  • 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
  • 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:
    $52.50
  • 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:
    $47.50
  • A layering piece designed like a second skin. The Stretch Thermal offers lightweight warmth and unsurpassed mobility in a soft, stretchable fleece.

    Our Price:
    $105.00
  • The highly versatile Drive is made with 200g/m merino fabric plus nanotechnology to keep you dry while you're running or working out. A zip collared neck lets you control your temperature so you stay comfortable throughout activity.

    Our Price:
    $84.00
  • This highly versatile crewe is made from 260g/m2 merino for warmth in cold conditions. Functional features include offset shoulder seams to prevent pack rub, forward side seams to eliminate chafing and a drop tail for additional coverage.

    Our Price:
    $60.00
  • Designed with a zip to help regulate temperature, the Relay Long Sleeve Half Zip is an incredibly versatile baselayer for any season. Made from merino wool, it naturally pulls moisture away from the body to ensure a comfortable fit.

    Our Price:
    $53.97
  • A network of tiny chambers within its fabric spreads moisture over a greater surface area for faster evaporation and a smoother, drier feel than other wicking systems. Wick.Q EVAP makes this UPF 50 hiking/trekking shirt an elite performer.

    Our Price:
    $30.00
  • These performance all-day briefs are the perfect combination of comfort and technology, featuring ergonomically wrapped seams with slight compression for comfort and support. Wear them to ensure that you make it through hot grueling temps.

    Our Price:
    $17.50
  • Light and soft against your skin, this innovative tee protects you from the sun while dispersing heat and moisture. It also boasts Omni-Freeze technology, which reacts with sweat to lower the temperature of the material.

    Our Price:
    $32.50
  • 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:
    $115.50
  • With cool colors, athletic styling, and a fantastic fit, these all-Merino briefs keep you comfortable year-round - and looking sharp.

    Our Price:
    $17.00
  • 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:
    $40.00
  • A best-selling baselayer designed to keep you warm and dry when the temperature really plummets.

    Our Price:
    $90.00
  • This men's long-sleeve base layer top is one of the best wool base layers on the market. The unique premium merino wool exterior provides superior insulation and moisture-wicking properties to keep you warm and dry.

    Our Price:
    $48.00
  • Made with soft, 18.5-micron 100% Merino Wool, the Indie is great as a midweight baselayer or midlayer.

    Our Price:
    $57.00
See Trekt Reviews at Bizrate.com