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Women's Midweight Base Layer Tops

(29 products)
Products (29)
Sort: Best Match
  • Sale Ends May 25
    REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
    $41.19
    Save 25%
    compared to  $54.95
    324 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
    $93.69
    Save 25%
    compared to  $125.00
    1223 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    Top Rated
    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
    $97.49
    Save 25%
    compared to  $130.00
    74 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    REI Co-opMidweight Base Layer Half-Zip Top - Women's
    $44.89
    Save 25%
    compared to  $59.95
    198 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
    $112.49
    Save 25%
    compared to  $150.00
    202 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Text reads: ‘Anniversary Sale 2026. 25% off’ over a collage of Smartwool long-sleeve shirts and colorful socks.

    Save 25% on all Smartwool clothing

  • Sale Ends May 25
    Top Rated
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
    $89.99
    Save 25%
    compared to  $120.00
    185 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
    $81.73 - $84.73
    Save 26% - 28%
    compared to  $115.00
    441 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's
    $89.73
    Save 25%
    compared to  $120.00
    72 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    PatagoniaCapilene Midweight Crew Base Layer Top - Women's
    $70.93
    Save 20%
    compared to  $89.00
    52 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
    $96.73
    Save 25%
    compared to  $130.00
    133 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Top Rated
    Kari TraaEdith Half-Zip Base Layer Top - Women's
    $76.73
    Save 30%
    compared to  $110.00
    12 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
    $63.73
    Save 35%
    compared to  $99.00
    31 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    SmartwoolClassic Thermal Merino Half-Zip Base Layer Hoodie - Women's
    $108.73
    Save 25%
    compared to  $145.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's
    $49.83 - $104.99
    Save 25% - 64%
    compared to  $140.00
    8 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
    $78.93
    Save 20%
    compared to  $99.00
    31 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends May 25
    Kari TraaRose Half-Zip Base Layer Top - Women's
    $97.99
    Save 30%
    compared to  $140.00
    31 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends May 25
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Base Layer Top - Women's
    $89.99
    Save 25%
    compared to  $120.00
    2 reviews with an average rating of 2.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends May 25
    Kari TraaAnna Half-Zip Base Layer Top - Women's
    $83.99
    Save 30%
    compared to  $120.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends May 25
    Top Rated
    IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women's
    $112.49
    Save 25%
    compared to  $150.00
    37 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    SmartwoolClassic Thermal Merino Mock Neck Base Layer Top - Women's
    $104.73
    Save 25%
    compared to  $140.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    SmartwoolIntraknit AS Merino Base Layer Crew Top - Women's
    $93.69
    Save 25%
    compared to  $125.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Women's
    $109.73
    Save 29%
    compared to  $155.00
    6 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    HalfdaysFay Midweight Merino Base Layer Top - Women's
    $97.49
    Save 25%
    compared to  $130.00
    38 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    ArtilectDarkhorse 185 Zoned Quarter-Zip Base Layer Top - Women's
    $75.73
    Save 55%
    compared to  $170.00
    3 reviews with an average rating of 3.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Women's
    $81.73
    Save 48%
    compared to  $160.00
    4 reviews with an average rating of 3.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's
    $93.73
    Save 25%
    compared to  $125.00
    1 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • 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.

    SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's
    $96.73
    Save 25%
    compared to  $130.00
    50 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenLIFA Merino Midweight Graphic Crew Base Layer - Women's
    $85.73
    Save 25%
    compared to  $115.00
    4 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Wild RyeBassett Half-Zip Base Layer Top - Women's
    $49.83
    Save 63%
    compared to  $135.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
Sort: Best Match