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

    As Low as:
    $29.40
  • Patagonia's most versatile synthetic baselayer keeps you dry and warm in cool to cold conditions - with a 1/4 zipper for ventilation.

    As Low as:
    $35.40
  • 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:
    $24.50
  • 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:
    $54.00
  • 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:
    $54.00
  • 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
  • This T-shirt is made of a lightweight 100% polyester jersey fabric that feels like cotton. It offers 20-UPF sun protection and can be worn in or out of the water. Great for beach adventures and backcountry fun.

    Our Price:
    $24.50
  • Get the most out of your run through narrow pathways and shaded forests in this light, trail-oriented tee. Polyester wicking fabric manages moisture and provides UPF 15 sun protection for hot weather hikes, climbs or runs.

    Our Price:
    $23.40
  • Make sure you have all the comfort and protection you need when hitting the trail in hot weather. Polyester wicking fabric manages moisture and provides UPF 15 sun protection for hot weather hikes, climbs or runs.

    Our Price:
    $23.40
  • The lightweight and breathable Whirlwind Hoody shields you from gusts high on the ridge of a 14er or eight pitches up the Diamond. Perfect as a heavier baselayer, the Whirlwind Hoody can stand on its own when hitting the trail hard.

    Our Price:
    $53.40
  • Surge is an Oasis Crewe from the Bodyfit active base layer collection, made with 200gm merino fabric for hiking or travelling in cool conditions. Its features include offset seams to prevent pack rub and free Seam flatlock stitching eliminates chafing.

    Our Price:
    $57.00
  • The indispensible Oasis Half Zip from the active base layer collection is made with lightweight 200gm merino fabric to keep you warm on cool weather expeditions. The zip neck collar lets you regulate your temperature and offset sleeves eliminate pack rub.

    Our Price:
    $60.00
See Trekt Reviews at Bizrate.com