Skip to search results
loaded 51 results

Lightweight Base Layer Bottoms

(51 products)
Products (51)
Sort: Best Match
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $79.95
    161 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Top Rated
    REI Co-opLightweight Base Layer Bottoms - Men's
    $44.95
    26 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $34.73 - $54.73
    Save 30% - 56%
    compared to  $79.00
    42 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    Arc'teryxRho Base Layer Bottoms - Women's
    $24.83 - $100.00
    37 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opLightweight Base Layer Tights - Women's
    $44.95
    10 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus, Petite
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $100.00
    23 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
    $100.00
    27 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI Co-opMerino 185 Base Layer Bottoms - Women's
    $79.95
    121 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's
    $150.00
    32 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    tasc PerformanceElevation Merino Base Layer Bottoms - Women's
    $54.73
    Save 30%
    compared to  $79.00
    66 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Top Rated
    Kari TraaRose High-Waisted Base Layer Pants - Women's
    $90.93 - $120.00
    14 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Arc'teryxRho LT Base Layer Bottoms - Men's
    $100.00
    59 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's
    $85.00
    4 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Ortovox120 Comp Light Short Base Layer Pants - Men's
    $70.00
    3 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Kari TraaKlara High-Waisted Base Layer Pants - Women's
    $62.73 - $66.73
    Save 25% - 30%
    compared to  $90.00
    14 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    HalfdaysSophia Base Layer Leggings - Women's
    $65.93 - $95.00
    123 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
    $150.00
    29 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Free CountryCloud Knit Base Layer Bottoms - Men's
    $26.73
    Save 33%
    compared to  $40.00
    3 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    Free CountryForce Grid Fleece Base Layer Bottoms - Women's
    $34.73
    Save 36%
    compared to  $55.00
    11 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    KUHLReactiv Lite Grid Base Layer Bottoms - Women's
    $73.93
    Save 25%
    compared to  $99.00
    3 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • Limited-time offer! The REI Co-op Mastercard.

    Get $130 in value

    $30 in card rewards are yours when approved for the REI Co-op Mastercard by Mar 9. Plus, you can earn a $100 REI gift card after your first purchase. Terms apply.

    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
    $92.73
    Save 28%
    compared to  $130.00
    29 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
    $49.93
    Save 37%
    compared to  $79.95
    11 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Plus
    Free CountryForce Grid Fleece Base Layer Bottoms - Men's
    $29.73
    Save 33%
    compared to  $45.00
    19 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    Kari TraaSval Base Layer Pants - Women's
    $49.73
    Save 28%
    compared to  $70.00
    2 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaFryd Base Layer Pants - Women's
    $40.73
    Save 25% - 32%
    compared to  $55.00 - $60.00
    18 reviews with an average rating of 3.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Kari TraaLucie Base Layer Pants - Women's
    $58.73
    Save 26%
    compared to  $80.00
    6 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    KUHLReactiv Lite Grid Base Layer Bottoms - Men's
    $99.00
    5 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Ortovox185 Rock'N'Wool Short Base Layer Pants - Men's
    $100.00 - $110.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Kari TraaFierce Base Layer Pants - Women's
    $46.73
    Save 29%
    compared to  $66.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Wild RyeJane Leggings - Women's
    $42.73
    Save 60%
    compared to  $109.00
    6 reviews with an average rating of 3.7 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
1–30 of 51 products
Sort: Best Match