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Base Layer Tops

(256 products)
Products (256)
Sort: Best Match
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
    $115.00
    1506 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Kari TraaFryd Base Layer Top - Women's
    $29.83 - $65.00
    22 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    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
    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
    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
    $79.95
    199 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
    $85.73
    Save 25%
    compared to  $115.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    276 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    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
    Arc'teryxLana Merino Wool Crew Base Layer Top - Women's
    $59.93
    Save 33%
    compared to  $90.00
    4 reviews with an average rating of 2.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opMidweight Crew Base Layer Top - Toddlers'
    $24.95
    14 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 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
    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
    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
    $120.00
    30 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
    $69.95
    21 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Plus
    Top Rated
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
    $105.00
    135 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    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
    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 Merino Crew Base Layer Top - Women's
    $96.73
    Save 25%
    compared to  $130.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    120 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
    SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's
    $82.73
    Save 28%
    compared to  $115.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends Today
    Top Rated
    ArtilectDarkhorse 185 Zoned Crew Base Layer Top - Men's
    $79.99
    Save 50%
    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
  • Sale Ends Today
    Top Rated
    IcebreakerMerino 260 Tech Long Sleeve Crewe Base Layer Top - Men's
    $82.49
    Save 50%
    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
  • Sale Ends Today
    SpraywayEffra Crew Base Layer Top - Women's
    $24.89
    Save 50%
    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
    Helly HansenLIFA Merino Midweight Crew Base Layer Top - Women's
    $69.73
    Save 30%
    compared to  $100.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Top Rated
    Black DiamondSolution 150 Merino Base Layer Crew Top - Women's
    $99.73
    Save 26%
    compared to  $135.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    20 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    REI Co-opMerino 185 Base Layer Top - Men's
    $69.95
    54 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
    $120.00
    90 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    IcebreakerMerino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
    $84.73
    Save 26%
    compared to  $115.00
    Members use code LABORDAY2025 for an extra 20% off at REI Outlet
    20 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Plus, Regular
    REI OUTLET
    Arc'teryxLana Merino Wool Base Layer Tank Top - Women's
    $59.93
    Save 33%
    compared to  $90.00
    2 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends Today
    Top Rated
    Icebreaker125 ZoneKnit Merino Long-Sleeve Crewe Thermal Top - Men's
    $62.49
    Save 50%
    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
    SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
    $95.00
    4 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
31–60 of 256 products
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