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Underwear: Deals

(356 products)
Products (356)
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    Ortovox185 Merino Rock'n'wool Long-Sleeve Base Layer Top - Men's
    $54.83
    Save 50%
    compared to  $110.00
    10 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    PatagoniaCapilene Midweight Base Layer Bottoms - Men's
    $59.93 - $89.00
    56 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Kari TraaRose Half-Zip Base Layer Top - Women's
    $59.83 - $140.00
    30 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    Kari TraaFryd Base Layer Top - Women's
    $29.83 - $65.00
    21 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    tasc PerformanceElevation Merino Base Layer Bottoms - Women's
    $49.73
    Save 37%
    compared to  $79.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    53 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Arc'teryxRho Base Layer Bottoms - Women's
    $24.83 - $100.00
    17 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
  • Sale Ends Sep 1
    Top Rated
    REI Co-opLightweight Base Layer Tights - Women's
    $27.89
    Save 30%
    compared to  $39.95
    7 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Free FlyElevate Boxer Briefs - Men's
    $28.73
    Save 24%
    compared to  $38.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    57 reviews with an average rating of 4.1 out of 5 stars
    Size Type:
    Regular, Big
    REI OUTLET
  • Sale Ends Sep 1
    REI Co-opLightweight Half-Zip Base Layer Top - Women's
    $31.39
    Save 30%
    compared to  $44.95
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
  • Sale Ends Sep 1
    Top Rated
    REI Co-opLightweight Crew Base Layer Top - Infants'/Toddlers'
    $13.89
    Save 30%
    compared to  $19.95
    10 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Ortovox185 Rock'n'wool Short Base Layer Pants - Men's
    $49.83
    Save 50%
    compared to  $100.00
    6 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    Arc'teryxRho Zip-Neck Base Layer Top - Women's
    $79.93 - $120.00
    11 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Boody Eco WearBoyleg Briefs - Women's - Package of 2
    $22.73
    Save 18%
    compared to  $27.95
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    10 reviews with an average rating of 3.2 out of 5 stars
    Size Type:
    Regular
    REI OUTLET
    Nani SwimwearUinta Base Layer Top - Women's
    $19.83
    Save 75%
    compared to  $80.00
    13 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's
    $89.73
    Save 25%
    compared to  $120.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    REI OUTLET
    tasc PerformanceElevation Merino T-Shirt - Men's
    $49.73
    Save 37%
    compared to  $79.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    38 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $49.73
    Save 37%
    compared to  $79.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    31 reviews with an average rating of 3.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's
    $39.83 - $90.00
    0 reviews
    Underwear Weight:
    Ultralightweight
    Size Type:
    Regular
  • Sale Ends Sep 1
    Top Rated
    REI Co-opLightweight Base Layer Bottoms - Infants'/Toddlers'
    $13.89
    Save 30%
    compared to  $19.95
    8 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
    $34.83 - $69.95
    21 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Plus
    Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's
    $34.73
    Save 30%
    compared to  $50.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    Kari TraaRose High-Waisted Base Layer Pants - Women's
    $54.83 - $130.00
    14 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Kari TraaEmbla Wool Base Layer Top - Women's
    $29.83
    Save 50%
    compared to  $60.00
    0 reviews
    Underwear Weight:
    Ultralightweight
    Size Type:
    Regular
    PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
    $69.93 - $109.00
    18 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big
    Arc'teryxRho Boot Cut Base Layer Bottoms - Women's
    $72.73
    Save 19%
    compared to  $90.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends Sep 1
    Top Rated
    REI Co-opLightweight Base Layer Crew Top - Kids'
    $20.89
    Save 30%
    compared to  $29.95
    12 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
    $46.83 - $95.00
    4 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
    $69.93 - $99.00
    61 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's
    $78.73
    Save 25%
    compared to  $105.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    70 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    REI OUTLET
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
    $44.73
    Save 31%
    compared to  $65.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    5 reviews with an average rating of 3.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
31–60 of 356 products
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