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Short Sleeve Base Layers

(16 products)
Products (16)
Remove sleeve-length filter:Short Sleeve
Sort: Best Match
  • Sale Ends May 25
    SmartwoolClassic All-Season Merino T-Shirt - Women's
    $59.99 - $71.19
    Save 25% - 36%
    compared to  $95.00
    110 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    Icebreaker125 Cool-Lite Merino Blend Sphere III Scoop T-Shirt - Women's
    $67.49
    Save 25%
    compared to  $90.00
    28 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends May 25
    Top Rated
    REI Co-opLightweight Crew Base Layer Top - Women's
    $26.19
    Save 25%
    compared to  $34.95
    30 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
  • Sale Ends May 25
    REI Co-opMerino 185 Base Layer Top - Men's
    $52.39
    Save 25%
    compared to  $69.95
    60 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends May 25
    REI Co-opMerino 185 Base Layer Top - Women's
    $52.39
    Save 25%
    compared to  $69.95
    67 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Text reads: ‘Anniversary Sale 2026. 25% off’ over a collage of Smartwool long-sleeve shirts and colorful socks.

    Save 25% on all Smartwool clothing

  • Sale Ends May 25
    SmartwoolClassic All-Season Merino T-Shirt - Men's
    $71.19
    Save 25%
    compared to  $95.00
    111 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
  • Sale Ends May 25
    Top Rated
    REI Co-opLightweight Crew Base Layer Top - Men's
    $26.19
    Save 25%
    compared to  $34.95
    32 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    Helly HansenHH Durawool Base Layer T-Shirt - Women's
    $56.73
    Save 29%
    compared to  $80.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Icebreaker200 Oasis Crewe Base Layer Top - Men's
    $82.49
    Save 25%
    compared to  $110.00
    49 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Arc'teryxIonia Merino Wool Base Layer Top - Men's
    $90.00
    49 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Midweight
    Size Type:
    Regular, Big
    Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's
    $84.73
    Save 26%
    compared to  $115.00
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's
    $84.73
    Save 26%
    compared to  $115.00
    7 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • Sale Ends May 25
    Kari TraaEmbla Wool Base Layer T-Shirt - Women's
    $55.99
    Save 30%
    compared to  $80.00
    0 reviews
    Underwear Weight:
    Ultralightweight
    Size Type:
    Regular
    Arc'teryxLana Merino Wool Crew Base Layer Top - Women's
    $90.00
    8 reviews with an average rating of 3.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Sale Ends May 25
    Kari TraaAlma T-Shirt - Women's
    $55.99
    Save 30%
    compared to  $80.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
    $19.83
    Save 71%
    compared to  $69.95
    32 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Plus
  • Limited time only! The R E I Co-op Mastercard.

    Get $130 in value

    When approved for the REI Co-op Mastercard by May 25, you’ll get $30 in card rewards. Plus, you can earn a $100 REI gift card after your first non-REI purchase within 60 days from account opening. Terms apply.

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