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Lightweight Base Layers

(120 products)
Products (120)
Remove underwear-weight filter:Lightweight
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    tasc PerformanceElevation Merino T-Shirt - Women's
    $54.73
    Save 30%
    compared to  $79.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    85 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
    $79.95
    215 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $79.95
    143 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Free CountryForce Grid Fleece Base Layer Top - Women's
    $34.73
    Save 36%
    compared to  $55.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    2 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Kari TraaKlara High-Waisted Base Layer Pants - Women's
    $62.73 - $66.73
    Save 25% - 30%
    compared to  $90.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    1 reviews with an average rating of 3.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Free CountryForce Grid Fleece Base Layer Bottoms - Women's
    $34.73
    Save 36%
    compared to  $55.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    9 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
    $27.93 - $44.95
    27 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    Top Rated
    Arc'teryxRho LT Base Layer Hoody - Men's
    $120.00
    55 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    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 OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    12 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    tasc PerformanceElevation Merino T-Shirt - Men's
    $54.73
    Save 30%
    compared to  $79.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    48 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
    $79.95
    233 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI Co-opMerino 185 Base Layer Bottoms - Women's
    $79.95
    119 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI Co-opLightweight Base Layer Bottoms - Men's
    $44.95
    21 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
    $90.00 - $100.00
    137 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Kari TraaSmekker Half-Zip Base Layer Top - Women's
    $140.00
    19 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Top Rated
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
    $90.00 - $100.00
    94 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Free CountryForce Grid Fleece Base Layer Bottoms - Men's
    $29.73
    Save 33%
    compared to  $45.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    13 reviews with an average rating of 3.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    tasc PerformanceElevation Merino Base Layer Bottoms - Women's
    $54.73
    Save 30%
    compared to  $79.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    59 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenHH Durawool Crew Long-Sleeve Shirt - Women's
    $64.73
    Save 28%
    compared to  $90.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $34.73 - $54.73
    Save 30% - 56%
    compared to  $79.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    40 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    Free CountryMicrotech Heat Cocarber Base Layer Bottoms - Women's
    $39.73
    Save 33%
    compared to  $60.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    6 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $90.00
    21 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
    $27.93 - $44.95
    28 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
    $89.95
    120 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Free CountryCloud Knit Crewneck Base Layer Top - Men's
    $26.73
    Save 33%
    compared to  $40.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    5 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    SmartwoolClassic All-Season Merino T-Shirt - Men's
    $80.00 - $95.00
    94 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    Free CountryMicrotech Heat Cocarber Base Layer Top - Women's
    $39.73
    Save 33%
    compared to  $60.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    7 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's
    $130.00
    31 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Free CountryCloud Knit Base Layer Bottoms - Men's
    $26.73
    Save 33%
    compared to  $40.00
    Members use code OUTJAN26 for $20 off when you spend $100+ at REI Outlet.
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    REI Co-opLightweight Base Layer Tights - Women's
    $44.95
    9 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus, Petite
1–30 of 120 products
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