Skip to search results
loaded 76 results

Blue Men's Underwear

(76 products)
Products (76)
Sort: Best Match
    REI Co-opMerino Boxer Briefs - Men's
    $39.95
    126 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Regular, Big
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $54.73
    Save 30%
    compared to  $79.00
    45 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    Top Rated
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $84.95
    5 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    SmartwoolIntraknit Thermal Merino Base Layer Colorblock Crew - Men's
    $96.73
    Save 25%
    compared to  $130.00
    18 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Big, Regular
    REI OUTLET
    tasc PerformanceElevation Merino T-Shirt - Men's
    $54.73
    Save 30%
    compared to  $79.00
    57 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    Top Rated
    SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
    $125.00
    762 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    REI Co-opEveryday Boxers - Men's
    $24.95
    153 reviews with an average rating of 4.2 out of 5 stars
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opMidweight Long-Sleeve Crew Base Layer Top - Men's
    $64.95
    8 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big, Tall
    REI Co-opEveryday Boxer Briefs - Men's
    $24.95
    170 reviews with an average rating of 4.1 out of 5 stars
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Crew Base Layer Top - Men's
    $84.95
    5 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    Top Rated
    SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
    $125.00
    1114 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    SaxxQuest Quick-Dry Boxer Briefs - Men's
    $36.00
    62 reviews with an average rating of 4.7 out of 5 stars
    Size Type:
    Regular, Big
    REI Co-opMerino 250 Base Layer Bottoms - Men's
    $104.95
    0 reviews
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
    IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
    $59.83 - $120.00
    101 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opMidweight Half-Zip Base Layer Top - Men's
    $69.95
    8 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big, Tall
    Top Rated
    SaxxQuest Quick-Dry Boxer Briefs - Men's - Package of 2
    $66.00
    41 reviews with an average rating of 4.7 out of 5 stars
    Size Type:
    Regular, Big
  • A yellow Member Bonus Card and two holiday-themed gift cards on a light colored background.

    Give the gift of the outdoors

    Members, get a $25 bonus e-card when you buy a $130+ gift card. Terms apply.

    Shop gift cards
    Top Rated
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
    $100.00
    545 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opMerino 185 Half-Zip Base Layer Top - Men's
    $89.95
    5 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
    $92.73 - $96.73
    Save 25% - 28%
    compared to  $130.00
    251 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    REI OUTLET
    REI Co-opMerino Boxers - Men's
    $39.95
    88 reviews with an average rating of 4.4 out of 5 stars
    Size Type:
    Regular, Big
    Top Rated
    SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
    $130.00
    681 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    SmartwoolClassic Thermal Merino Colorblock Crew Base Layer Top - Men's
    $90.87
    Save 30%
    compared to  $130.00
    2 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    REI OUTLET
    Helly HansenHH Durawool Long-Sleeve Henley Base Layer Top - Men's
    $69.97
    Save 30%
    compared to  $100.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    REI Co-opMerino 250 Long-Sleeve Crew Base Layer Top - Men's
    $104.95
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
    REI Co-opMerino 185 Crew Base Layer Top - Men's
    $74.95
    4 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    REI Co-opMerino 250 Half-Zip Base Layer Top - Men's
    $109.95
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Heavyweight
    Size Type:
    Regular, Big, Tall
    Top Rated
    Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
    $120.00
    111 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    Arc'teryxRho LT Crew Neck Base Layer Top - Men's
    $100.00
    64 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    PatagoniaCapilene Midweight Crew Base Layer Top - Men's
    $95.00
    0 reviews
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Top Rated
    IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
    $120.00
    113 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
Sort: Best Match

Related Expert Advice articles

Illustration of a hand holding a phone.

Checkout faster

Track your order, shop and save— all in one place

Get the REI app