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Women's Lightweight Base Layer Bottoms

(18 products)
Products (18)
Sort: Best Match
    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 - 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
    Top Rated
    REI Co-opLightweight Base Layer Tights - Women's
    $33.69
    Save 25%
    compared to  $44.95
    11 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus, Petite
    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
    Kari TraaKlara High-Waisted Base Layer Pants - Women's
    $62.73
    Save 30%
    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
  • Text reads: ‘Anniversary Sale 2026. 25% off’ over a collage of Smartwool long-sleeve shirts and colorful socks.

    Save 25% on all Smartwool clothing

    HalfdaysSophia Base Layer Leggings - Women's
    $29.83 - $71.19
    Save 25% - 68%
    compared to  $95.00
    123 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    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
    Arc'teryxRho Base Layer Bottoms - Women's
    $59.83 - $100.00
    38 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Kari TraaFierce Base Layer Pants - Women's
    $45.73
    Save 30%
    compared to  $66.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • 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
  • Sale Ends May 25
    Kari TraaFryd Base Layer Pants - Women's
    $37.73
    Save 31% - 37%
    compared to  $55.00 - $60.00
    18 reviews with an average rating of 3.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
  • Sale Ends May 25
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
    $112.49
    Save 25%
    compared to  $150.00
    30 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Kari TraaLucie Base Layer Pants - Women's
    $55.73
    Save 30%
    compared to  $80.00
    6 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 21
    Free CountryForce Grid Fleece Base Layer Bottoms - Women's
    $19.73
    Save 64%
    compared to  $55.00
    11 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 21
    Kari TraaSval Base Layer Pants - Women's
    $43.73
    Save 37%
    compared to  $70.00
    2 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    RHONEApres Houndstooth Seamless Base Layer Leggings - Women's
    $88.93
    Save 30%
    compared to  $128.00
    3 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Wild RyeBassett LITE Base Layer Leggings - Women's
    $29.83
    Save 66%
    compared to  $89.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
    $19.83
    Save 75%
    compared to  $79.95
    11 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Plus
  • 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.

Sort: Best Match