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Men's Base Layers

(121 products)
Products (121)
Sort: Best Match
    REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
    $49.83 - $99.95
    43 reviews with an average rating of 4.4 out of 5 stars
    Top Rated
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
    $66.93 - $100.00
    101 reviews with an average rating of 4.6 out of 5 stars
    Top Rated
    REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
    $26.83 - $41.19
    Save 25% - 51%
    compared to  $54.95
    200 reviews with an average rating of 4.6 out of 5 stars
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
    $44.83 - $67.39
    Save 25% - 50%
    compared to  $89.95
    124 reviews with an average rating of 4.5 out of 5 stars
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
    $125.00
    1514 reviews with an average rating of 4.7 out of 5 stars
    Top Rated
    REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
    $49.83 - $99.95
    18 reviews with an average rating of 4.8 out of 5 stars
  • Sale Ends Mar 23
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $59.89
    Save 25%
    compared to  $79.95
    162 reviews with an average rating of 4.2 out of 5 stars
  • Sale Ends Mar 23
    REI Co-opMidweight Base Layer Bottoms - Men's
    $41.19
    Save 25%
    compared to  $54.95
    101 reviews with an average rating of 4.5 out of 5 stars
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
    $125.00
    640 reviews with an average rating of 4.7 out of 5 stars
    Top Rated
    REI Co-opMidweight Base Layer Half-Zip Top - Men's
    $29.83 - $44.89
    Save 25% - 50%
    compared to  $59.95
    182 reviews with an average rating of 4.6 out of 5 stars
    Top Rated
    REI Co-opLightweight Base Layer Bottoms - Men's
    $44.95
    27 reviews with an average rating of 4.6 out of 5 stars
    PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
    $48.83 - $99.00
    75 reviews with an average rating of 4.4 out of 5 stars
    Top Rated
    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
    $130.00
    53 reviews with an average rating of 4.8 out of 5 stars
    Top Rated
    PatagoniaCapilene Midweight Crew Base Layer Top - Men's
    $43.83 - $89.00
    89 reviews with an average rating of 4.5 out of 5 stars
  • Sale Ends Mar 23
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
    $59.89
    Save 25%
    compared to  $79.95
    222 reviews with an average rating of 4.5 out of 5 stars
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
    $100.00
    28 reviews with an average rating of 4.3 out of 5 stars
    SmartwoolClassic All-Season Merino T-Shirt - Men's
    $95.00
    98 reviews with an average rating of 4.0 out of 5 stars
    REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
    $44.95
    36 reviews with an average rating of 4.5 out of 5 stars
    Top Rated
    SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
    $105.00
    7 reviews with an average rating of 4.9 out of 5 stars
    tasc PerformanceElevation Merino T-Shirt - Men's
    $34.73 - $54.73
    Save 30% - 56%
    compared to  $79.00
    52 reviews with an average rating of 4.4 out of 5 stars
    REI OUTLET
  • The R E I Co-op Mastercard. Earn 15% total R E I rewards.

    Earn 15% in total rewards

    Get 5% on all REI Co-op purchases plus the 10% Co-op Member Reward you earn on eligible full-price purchases.



    Terms apply
    REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
    $72.93 - $104.95
    27 reviews with an average rating of 4.2 out of 5 stars
    New arrival
    SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
    $78.73
    Save 25%
    compared to  $105.00
    0 reviews
    REI OUTLET
    Top Rated
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
    $51.83 - $120.00
    220 reviews with an average rating of 4.7 out of 5 stars
    Top Rated
    REI Co-opLightweight Crew Base Layer Top - Men's
    $34.95
    27 reviews with an average rating of 4.6 out of 5 stars
  • Sale Ends Mar 23
    REI Co-opMerino 185 Base Layer Top - Men's
    $52.39
    Save 25%
    compared to  $69.95
    58 reviews with an average rating of 4.3 out of 5 stars
    Top Rated
    IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
    $61.83 - $125.00
    79 reviews with an average rating of 4.7 out of 5 stars
    PatagoniaCapilene Thermal Weight Zip-Neck Base Layer Top - Men's
    $69.73
    Save 36%
    compared to  $109.00
    25 reviews with an average rating of 3.9 out of 5 stars
    REI OUTLET
    Top Rated
    PatagoniaCapilene Midweight Base Layer Bottoms - Men's
    $89.00
    59 reviews with an average rating of 4.5 out of 5 stars
    Top Rated
    Arc'teryxRho LT Crew Neck Base Layer Top - Men's
    $100.00
    40 reviews with an average rating of 4.8 out of 5 stars
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $34.73 - $54.73
    Save 30% - 56%
    compared to  $79.00
    43 reviews with an average rating of 4.0 out of 5 stars
    REI OUTLET
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