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    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
    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
    REI OUTLET
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
    $46.73
    Save 28%
    compared to  $65.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    52 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaRose High-Waisted Base Layer Pants - Women's
    $54.83 - $130.00
    24 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Top Rated
    PatagoniaCapilene Midweight Crew Base Layer Top - Men's
    $59.93 - $89.00
    79 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    Kari TraaRose Half-Zip Base Layer Top - Women's
    $59.83 - $140.00
    48 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
    $44.73 - $46.73
    Save 28% - 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
    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
    Black DiamondSolution 150 Merino Base Layer Bottoms - Women's
    $79.73
    Save 27%
    compared to  $110.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    31 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
    $92.73
    Save 28%
    compared to  $130.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    27 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
    $51.83 - $105.00
    134 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Men's
    $109.73
    Save 31%
    compared to  $160.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    7 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    Arc'teryxIonia Merino Wool Base Layer Hoody - Men's
    $98.93
    Save 29%
    compared to  $140.00
    51 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    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
    SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Men's
    $89.73
    Save 25%
    compared to  $120.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    19 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    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
    Top Rated
    Arc'teryxIonia Merino Wool Base Layer Top - Men's
    $63.93
    Save 28%
    compared to  $90.00
    40 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    Top Rated
    IcebreakerMerino 260 Tech Long Sleeve Crewe Base Layer Top - Men's
    $119.73
    Save 27%
    compared to  $165.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    5 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's
    $69.73
    Save 30%
    compared to  $100.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    3 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Top Rated
    IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
    $99.73
    Save 26%
    compared to  $135.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    26 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
    REI OUTLET
    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
    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
    SmartwoolIntraknit Thermal Max Merino Base Layer Bottoms - Women's
    $100.73
    Save 25%
    compared to  $135.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    0 reviews
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    Arc'teryxRho Heavyweight Base Layer Bottoms - Men's
    $96.73
    Save 19%
    compared to  $120.00
    47 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    Icebreaker125 ZoneKnit Merino Long-Sleeve Crewe Thermal Top - Men's
    $93.73
    Save 25%
    compared to  $125.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    6 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Ultralightweight
    Size Type:
    Regular, Big
    REI OUTLET
    SpraywayEffra Crew Base Layer Top - Women's
    $36.73
    Save 26%
    compared to  $49.95
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
    REI OUTLET
    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
    Top Rated
    SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men's
    $66.73
    Save 25%
    compared to  $90.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    67 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    PatagoniaCapilene Midweight Crew Base Layer Top - Women's
    $59.93 - $89.00
    45 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    New arrival
    Hot ChillysClima-Wool Base Layer Bottoms - Men's
    $79.73
    Save 33%
    compared to  $120.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    REI OUTLET
31–60 of 231 products
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