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Long Sleeve Base Layers

(259 products)
Products (259)
Remove sleeve-length filter:Long Sleeve
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    REI Co-opMidweight Long-Sleeve Base Layer Top - Women's

    $26.83 - $38.39
    Save 30% - 51%
    compared to  $54.95
    204 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends Nov 25
    Top Rated

    REI Co-opMidweight Long-Sleeve Base Layer Top - Men's

    $38.39
    Save 30%
    compared to  $54.95
    122 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Nov 25
    Top Rated

    SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's

    $86.19
    Save 25%
    compared to  $115.00
    1096 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends Nov 25

    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's

    $55.89
    Save 30%
    compared to  $79.95
    174 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends Nov 25

    REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's

    $69.89
    Save 30%
    compared to  $99.95
    2 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Nov 25
    Top Rated

    REI Co-opMidweight Base Layer Half-Zip Top - Men's

    $41.89
    Save 30%
    compared to  $59.95
    113 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Nov 25
    Top Rated

    Classic Thermal Merino Crew Base Layer Top - Men's

    $86.19
    Save 25%
    compared to  $115.00
    1449 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25

    REI Co-opMidweight Base Layer Half-Zip Top - Women's

    $41.89
    Save 30%
    compared to  $59.95
    112 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends Nov 25

    REI Co-opMidweight Base Layer Crew Top - Kids'

    $24.39
    Save 30%
    compared to  $34.95
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends Nov 25

    REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's

    $73.39
    Save 30%
    compared to  $104.95
    3 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
  • Sale Ends Nov 25
    Top Rated

    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's

    $55.89
    Save 30%
    compared to  $79.95
    149 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 Crewe Thermal Top - Women's

    $62.83 - $78.69
    Save 25% - 40%
    compared to  $105.00
    65 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
    Top Rated

    REI Co-opLightweight Base Layer Long-Sleeve Crew Top - Men's

    $27.93
    Save 30%
    compared to  $39.95
    185 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25

    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's

    $89.99
    Save 25%
    compared to  $120.00
    3 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25
    Top Rated

    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's

    $78.69
    Save 25%
    compared to  $105.00
    61 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25

    REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's

    $69.89
    Save 30%
    compared to  $99.95
    3 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Plus
  • Sale Ends Nov 25
    Top Rated

    REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's

    $62.89
    Save 30%
    compared to  $89.95
    92 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25

    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's

    $67.49
    Save 25%
    compared to  $90.00
    36 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big

    PatagoniaCapilene Midweight Crew Base Layer Top - Men's

    $89.00
    67 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated

    Arc'teryxRho LT Base Layer Hoodie - Men's

    $120.00
    35 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25
    Top Rated

    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's

    $89.99
    Save 25%
    compared to  $120.00
    5 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Plus
  • Sale Ends Today

    CraftCore Dry Base-Layer Set - Women's

    $43.73
    Save 41%
    compared to  $74.95
    11 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends Nov 25

    REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's

    $73.39
    Save 30%
    compared to  $104.95
    6 reviews with an average rating of 3.8 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Today

    IcebreakerMerino 260 Vertex Long-Sleeve Half-Zip Natural Shades Base Layer Top - Women's

    $64.73
    Save 56%
    compared to  $150.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends Nov 25

    SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's

    $97.49
    Save 25%
    compared to  $130.00
    183 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Nov 25
    Top Rated

    REI Co-opMerino Midweight Base Layer Crew Top - Kids'

    $34.89
    Save 30%
    compared to  $49.95
    21 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends Nov 25

    SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'

    $48.69
    Save 25%
    compared to  $65.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends Nov 25
    Top Rated

    REI Co-opMidweight Crew Base Layer Top - Toddlers'

    $17.39
    Save 30%
    compared to  $24.95
    14 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
  • Sale Ends Nov 25

    Kari TraaSara Half-Zip Base Layer Top - Women's

    $82.49
    Save 25%
    compared to  $110.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular
  • Sale Ends Nov 25

    SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's

    $97.49
    Save 25%
    compared to  $130.00
    81 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular
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