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Underwear

(413 products)
Products (413)
Sort: Best Match
  • Sale Ends May 25
    REI Co-opMerino Boxer Briefs - Men's
    $29.89
    Save 25%
    compared to  $39.95
    116 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Regular, Big
  • Sale Ends May 25
    REI Co-opMerino Hipster Underwear - Women's
    $22.39
    Save 25%
    compared to  $29.95
    59 reviews with an average rating of 3.9 out of 5 stars
    Size Type:
    Plus, Regular
    SaxxQuest Quick-Dry Boxer Briefs - Men's
    $34.00
    3 reviews with an average rating of 4.7 out of 5 stars
    Size Type:
    Regular, Big
    Top Rated
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
    $39.83 - $74.99
    Save 25% - 60%
    compared to  $100.00
    106 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    ExOfficioGNG 2.0 Hipster Briefs - Women's
    $16.73
    Save 30%
    compared to  $24.00
    424 reviews with an average rating of 3.9 out of 5 stars
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
    $67.39
    Save 25%
    compared to  $89.95
    137 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends May 25
    REI Co-opMerino Boxers - Men's
    $29.89
    Save 25%
    compared to  $39.95
    82 reviews with an average rating of 4.3 out of 5 stars
    Size Type:
    Regular, Big
    ExOfficioEveryday Bikini Underwear - Women's
    $16.73
    Save 30%
    compared to  $24.00
    108 reviews with an average rating of 3.9 out of 5 stars
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    VuoriAllTheFeels Bra
    $58.00
    10 reviews with an average rating of 4.8 out of 5 stars
    Bra Support:
    Low Impact
    Support Style:
    Compression
    Fabric:
    75% recycled polyamide/25% elastane
  • Sale Ends May 25
    REI Co-opMidweight Base Layer Tights - Women's
    $41.19
    Save 25%
    compared to  $54.95
    126 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus, Petite
  • Sale Ends May 25
    REI Co-opEveryday Boxers - Men's
    $18.69
    Save 25%
    compared to  $24.95
    140 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Regular, Big
  • Sale Ends May 25
    REI Co-opActive Bralette 2.0
    $26.89
    Save 25%
    compared to  $35.95
    134 reviews with an average rating of 4.3 out of 5 stars
    Bra Support:
    Low Impact
    Support Style:
    Encapsulation
    Fabric:
    86% polyester/14% spandex mesh
    Top Rated
    SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
    $69.73
    Save 26%
    compared to  $95.00
    6 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    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 Long-Sleeve Base Layer Top - Women's
    $59.89
    Save 25%
    compared to  $79.95
    246 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends May 25
    REI Co-opActive Hipster Underwear - Women's
    $14.89
    Save 25%
    compared to  $19.95
    42 reviews with an average rating of 3.8 out of 5 stars
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    Top Rated
    Beyond YogaSpacedye Lift Your Spirits Bra
    $50.99
    Save 25%
    compared to  $68.00
    859 reviews with an average rating of 4.7 out of 5 stars
    Bra Support:
    Medium Impact
    Support Style:
    Encapsulation
    Fabric:
    87% polyester/13% spandex
    ExOfficioEveryday Boxer Briefs - Men's
    $19.73
    Save 34%
    compared to  $30.00
    211 reviews with an average rating of 3.9 out of 5 stars
    Size Type:
    Regular, Big
    REI OUTLET
    Top Rated
    REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
    $29.83 - $104.95
    35 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
    $49.83 - $74.99
    Save 25% - 50%
    compared to  $100.00
    100 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
    $49.83 - $93.69
    Save 25% - 60%
    compared to  $125.00
    1222 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    BrooksConvertible 2.0 Sports Bra
    $41.99 - $45.49
    Save 30%
    compared to  $60.00 - $65.00
    161 reviews with an average rating of 3.9 out of 5 stars
    Bra Support:
    High Impact
    Support Style:
    Compression
    Fabric:
    Shell 1: 79% recycled polyester/21% spandex; shell 2: 78% recycled polyester/22% spandex
  • Sale Ends May 25
    Top Rated
    REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
    $33.69
    Save 25%
    compared to  $44.95
    38 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    REI Co-opMerino 185 Base Layer Top - Women's
    $52.39
    Save 25%
    compared to  $69.95
    67 reviews with an average rating of 4.3 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.

    New arrival
    ExOfficioEveryday Bralette
    $26.73
    Save 33%
    compared to  $40.00
    99 reviews with an average rating of 4.2 out of 5 stars
    Bra Support:
    Low Impact
    Support Style:
    Compression
    Fabric:
    95% viscose/5% elastane jersey
    REI OUTLET
    Panache SportEndurance Wired Sports Bra
    $57.93 - $88.00
    14 reviews with an average rating of 4.4 out of 5 stars
    Bra Support:
    High Impact
    Support Style:
    Encapsulation
    Fabric:
    49% polyamide/29% polyester/19% LYCRA Adaptiv/2% TACTEL/1% elastane
    prAnaHeavana Every Minute Bra
    $36.73
    Save 36%
    compared to  $58.00
    37 reviews with an average rating of 4.2 out of 5 stars
    Bra Support:
    Low Impact
    Support Style:
    Compression / Encapsulation
    Fabric:
    87% recycled polyester/13% elastane
    REI OUTLET
    VuoriAllTheForm Bra
    $68.00
    0 reviews
    Bra Support:
    Medium Impact
    Support Style:
    Compression
    Fabric:
    74% polyamide/26% elastane
    StanceCeramic 3 Boxer Briefs - Men's
    $19.73
    Save 34%
    compared to  $30.00
    0 reviews
    Size Type:
    Regular
    REI OUTLET
    StanceCheck Me Out Boxer Briefs - Men's
    $19.73
    Save 34%
    compared to  $30.00
    0 reviews
    Size Type:
    Regular
    REI OUTLET
1–30 of 413 products
Sort: Best Match

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