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Men's Base Layer Tops

(85 products)
Products (85)
Sort: Best Match
    Top Rated
    REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
    $54.95
    172 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Dec 1
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
    $86.19
    Save 25%
    compared to  $115.00
    1507 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
    $27.93 - $39.95
    19 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Dec 8
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
    $55.89
    Save 30%
    compared to  $79.95
    191 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends Dec 1
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
    $67.49
    Save 25%
    compared to  $90.00
    67 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opMidweight Base Layer Half-Zip Top - Men's
    $59.95
    156 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big, Tall
    REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
    $99.95
    28 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Dec 1
    Top Rated
    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
    $89.99
    Save 25%
    compared to  $120.00
    31 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opLightweight Half-Zip Base Layer Top - Men's
    $44.95
    11 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opLightweight Crew Base Layer Top - Men's
    $19.93 - $29.95
    21 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends Dec 1
    SmartwoolClassic All-Season Merino T-Shirt - Men's
    $59.99
    Save 25%
    compared to  $80.00
    89 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    tasc PerformanceElevation Merino T-Shirt - Men's
    $54.73
    Save 30%
    compared to  $79.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    41 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
  • Sale Ends Dec 8
    REI Co-opMerino 185 Base Layer Top - Men's
    $48.89
    Save 30%
    compared to  $69.95
    54 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends Dec 8
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
    $62.89
    Save 30%
    compared to  $89.95
    111 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
    $104.95
    16 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Dec 1
    Top Rated
    SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
    $71.19
    Save 25%
    compared to  $95.00
    5 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    Free CountryForce Grid Fleece Base Layer Top - Men's
    $29.73
    Save 33%
    compared to  $45.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    5 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
  • Sale Ends Dec 1
    SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
    $97.49
    Save 25%
    compared to  $130.00
    190 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Dec 8
    Top Rated
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
    $78.69
    Save 25%
    compared to  $105.00
    168 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    PatagoniaCapilene Midweight Crew Base Layer Top - Men's
    $89.00
    86 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Free CountryCloud Knit Crewneck Base Layer Top - Men's
    $26.73
    Save 33%
    compared to  $40.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    2 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
  • Sale Ends Dec 8
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes
    $55.89
    Save 30%
    compared to  $79.95
    8 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Tall
    Top Rated
    Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
    $120.00
    35 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
    $99.00
    10 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big
    SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
    $92.73
    Save 28%
    compared to  $130.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    9 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    REI OUTLET
    Top Rated
    PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
    $99.00
    64 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
  • Sale Ends Dec 8
    Top Rated
    IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
    $93.69
    Save 25%
    compared to  $125.00
    64 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big
    SaxxRoast Master Midweight Long-Sleeve Crew Base Layer Top - Men's
    $47.73
    Save 36%
    compared to  $75.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    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 CYBER2025 to save an extra 25% on this item, thru 12/1
    5 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
  • Sale Ends Dec 1
    Top Rated
    SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
    $104.99
    Save 25%
    compared to  $140.00
    11 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
1–30 of 85 products
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