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Boys' Underwear: Deals

(24 products)
Products (24)
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  • Sale Ends May 25
    IcebreakerMerino 200 Oasis Base Layer Leggings - Kids'
    $44.99
    Save 25%
    compared to  $60.00
    8 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Top Rated
    REI Co-opMidweight Base Layer Bottoms - Kids'
    $25.93
    Save 25%
    compared to  $34.95
    14 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Top Rated
    REI Co-opMidweight Base Layer Crew Top - Kids'
    $25.93
    Save 25%
    compared to  $34.95
    8 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Top Rated
    REI Co-opMidweight Base Layer Crew Top - Toddlers'
    $17.93
    Save 28%
    compared to  $24.95
    16 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Top Rated
    REI Co-opMidweight Base Layer Bottoms - Toddlers'
    $17.93
    Save 28%
    compared to  $24.95
    9 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    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
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
    $44.73
    Save 25% - 31%
    compared to  $60.00 - $65.00
    7 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    REI Co-opMerino Midweight Base Layer Crew Top - Kids'
    $24.83
    Save 50%
    compared to  $49.95
    32 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    StanceBrong Poly Boxer Briefs - Boys'
    $9.73
    Save 35%
    compared to  $15.00
    0 reviews
    REI OUTLET
    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
    SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Kids'
    $49.73
    Save 28%
    compared to  $70.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    StanceBFF Poly Boxer Briefs - Boys'
    $9.73
    Save 35%
    compared to  $15.00
    0 reviews
    REI OUTLET
    The North FaceDotKnit Thermal Base Layer Set - Kids'
    $51.73
    Save 26%
    compared to  $70.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    PatagoniaCapilene Midweight Base Layer Bottoms - Kids'
    $28.73
    Save 26%
    compared to  $39.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    StanceFlower Flora Poly Boxer Briefs - Boys'
    $9.73
    Save 35%
    compared to  $15.00
    0 reviews
    REI OUTLET
    StanceSolid Poly Boxer Briefs - Boys'
    $9.73
    Save 35%
    compared to  $15.00
    0 reviews
    REI OUTLET
    ObermeyerComfy Cozy Base Layer Set - Kids'
    $42.73
    Save 27%
    compared to  $59.00
    1 reviews with an average rating of 1.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Hot ChillysOriginals Solid Base Layer Crew - Kids'
    $34.73
    Save 26%
    compared to  $47.50
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Hot ChillysOriginals Print Base Layer Crew - Kids'
    $39.73
    Save 27%
    compared to  $55.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    ObermeyerComfy Cozy Cargo Base-Layer Set - Kids'
    $45.73
    Save 33%
    compared to  $69.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Hot ChillysOriginals Print Base Layer Pants - Kids'
    $39.73
    Save 27%
    compared to  $55.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenGraphic Lifa Merino Base Layer Set - Kids'
    $93.73
    Save 25%
    compared to  $125.00
    1 reviews with an average rating of 1.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular
    REI OUTLET
    Hot ChillysPeach Skins T-Neck Base Layer Top - Kids'
    $32.73
    Save 34%
    compared to  $50.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Icebreaker200 Oasis Base Layer Leggings - Kids'
    $29.83
    Save 50%
    compared to  $60.00
    10 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    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.

Sort: Best Match