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Men's Underwear

(191 products)
Products (191)
Sort: Best Match
    REI Co-opMerino Boxer Briefs - Men's
    $39.95
    106 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Regular, Big
    REI Co-opMidweight Base Layer Bottoms - Men's
    $54.95
    82 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big, Tall
    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
    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
    REI Co-opEveryday Boxers - Men's
    $22.95
    129 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Regular, Big
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $34.73 - $54.73
    Save 30% - 56%
    compared to  $79.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    35 reviews with an average rating of 3.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    Top Rated
    REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
    $99.95
    9 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
    Top Rated
    REI Co-opLightweight Base Layer Bottoms - Men's
    $39.95
    15 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
  • Sale Ends Dec 1
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
    $86.19
    Save 25%
    compared to  $115.00
    624 reviews with an average rating of 4.7 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
    REI Co-opMerino Boxers - Men's
    $39.95
    69 reviews with an average rating of 4.3 out of 5 stars
    Size Type:
    Regular, Big
    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 8
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $55.89
    Save 30%
    compared to  $79.95
    132 reviews with an average rating of 4.3 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
    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
    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
  • 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
    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
  • 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
  • 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
    REI Co-opEveryday Boxer Briefs - Men's
    $22.95
    156 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Big
    Top Rated
    ExOfficioGive-N-Go 2.0 Boxer Briefs - Men's
    $22.73
    Save 24%
    compared to  $30.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    2919 reviews with an average rating of 4.5 out of 5 stars
    Size Type:
    Regular, Big
    REI OUTLET
    SaxxVibe Xtra Soft Comfort Boxer Briefs - Men's
    $24.73
    Save 27%
    compared to  $34.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    0 reviews
    Size Type:
    Regular, Big
    REI OUTLET
    Top Rated
    ExOfficio9" GNG Sport 2.0 Boxer Briefs - Men's
    $24.73
    Save 27%
    compared to  $34.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    529 reviews with an average rating of 4.7 out of 5 stars
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends Dec 1
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
    $67.49
    Save 25%
    compared to  $90.00
    20 reviews with an average rating of 4.1 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 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 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
    SaxxQuest Boxer Briefs - Men's
    $24.73
    Save 27%
    compared to  $34.00
    Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
    3 reviews with an average rating of 4.7 out of 5 stars
    Size Type:
    Regular, Big
    REI OUTLET
1–30 of 191 products
Sort: Best Match

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