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Merino Wool Base Layer Bottoms

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Products (54)
Remove features filter:Merino Wool
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  • Sale Ends May 25
    REI Co-opMerino 185 Base Layer Bottoms - Women's
    $59.89
    Save 25%
    compared to  $79.95
    122 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends May 25
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's
    $63.49
    Save 44%
    compared to  $115.00
    280 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    REI Co-opHeavyweight Merino Base Layer Bottoms - Women's
    $29.83 - $74.89
    Save 25% - 70%
    compared to  $99.95
    34 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
    $93.69
    Save 25%
    compared to  $125.00
    647 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $49.83 - $74.99
    Save 25% - 50%
    compared to  $100.00
    25 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $59.89
    Save 25%
    compared to  $79.95
    169 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    tasc PerformanceElevation Merino Base Layer Bottoms - Women's
    $46.73
    Save 40%
    compared to  $79.00
    67 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
    $74.99
    Save 25%
    compared to  $100.00
    30 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends May 25
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's
    $93.69
    Save 25%
    compared to  $125.00
    769 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends May 25
    Top Rated
    REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
    $74.89
    Save 25%
    compared to  $99.95
    21 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends May 25
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's
    $112.49
    Save 25%
    compared to  $150.00
    33 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    SmartwoolIntraknit Merino 3/4 Base Layer Bottoms - Women's
    $89.73
    Save 25%
    compared to  $120.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Top Rated
    IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
    $89.99
    Save 25%
    compared to  $120.00
    87 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
    $78.73
    Save 25%
    compared to  $105.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    REI OUTLET
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $46.73 - $54.73
    Save 30% - 40%
    compared to  $79.00
    44 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    Kari TraaKlara High-Waisted Base Layer Pants - Women's
    $46.69 - $62.73
    Save 30% - 48%
    compared to  $90.00
    14 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
    $48.73
    Save 25%
    compared to  $65.00
    47 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Top Rated
    SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
    $86.19
    Save 25%
    compared to  $115.00
    87 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends May 25
    SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's
    $63.69
    Save 25%
    compared to  $85.00
    5 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opMerino Midweight Base Layer Bottoms - Kids'
    $24.83
    Save 50%
    compared to  $49.95
    16 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Arc'teryxSatoro Merino Wool Base Layer Bottoms - Women's
    $95.73
    Save 20%
    compared to  $120.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Top Rated
    IcebreakerMerino 200 Oasis Thermal Leggings - Women's
    $89.99
    Save 25%
    compared to  $120.00
    89 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    SmartwoolIntraknit AS Merino Base Layer Bottoms - Men's
    $93.69
    Save 25%
    compared to  $125.00
    2 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends May 25
    Top Rated
    Kari TraaRose High-Waisted Base Layer Pants - Women's
    $83.99
    Save 30%
    compared to  $120.00
    14 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Limited time only! The R E I Co-op Mastercard.

    Get $130 in value

    When approved for the REI Co-op Mastercard by May 25, you’ll get $30 in card rewards. Plus, you can earn a $100 REI gift card after your first non-REI purchase within 60 days from account opening. Terms apply.

  • Sale Ends May 25
    Top Rated
    Icebreaker260 Tech High-Rise Base Layer Leggings - Women's
    $93.69
    Save 25%
    compared to  $125.00
    24 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends May 25
    Top Rated
    Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
    $104.99
    Save 25%
    compared to  $140.00
    73 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big
  • Sale Ends May 25
    SmartwoolIntraknit AS Merino Base Layer Bottoms - Women's
    $93.69
    Save 25%
    compared to  $125.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Helly HansenLIFA Merino Midweight Graphic Base Layer Pants - Women's
    $85.73
    Save 25%
    compared to  $115.00
    1 reviews with an average rating of 1.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Icebreaker260 Tech Base Layer Leggings - Women's
    $93.69
    Save 25%
    compared to  $125.00
    34 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes
    $49.83 - $93.69
    Save 25% - 60%
    compared to  $125.00
    20 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Plus
1–30 of 54 products
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