Skip to search results
loaded 45 results

Lightweight Base Layer Bottoms

(45 products)
Products (45)
Sort: Best Match
    REI Co-opMerino 185 Base Layer Bottoms - Women's
    $49.93
    Save 37%
    compared to  $79.95
    125 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $49.83 - $100.00
    26 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opLightweight Base Layer Bottoms - Men's
    $44.95
    31 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big, Tall
    REI Co-opMerino 185 Base Layer Bottoms - Men's
    $49.93
    Save 37%
    compared to  $79.95
    173 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    tasc PerformanceElevation Merino Base Layer Bottoms - Women's
    $44.73
    Save 43%
    compared to  $79.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    68 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    REI Co-opLightweight Base Layer Tights - Women's
    $44.95
    12 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus, Petite
    Kari TraaSval Base Layer Pants - Women's
    $48.73
    Save 30%
    compared to  $70.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    2 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    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 OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    14 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $66.73
    Save 25%
    compared to  $90.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
    $100.00
    30 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Arc'teryxSatoro Merino Wool Base Layer Bottoms - Women's
    $95.73
    Save 20%
    compared to  $120.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    16 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    tasc PerformanceElevation Merino Base Layer Bottoms - Men's
    $44.73
    Save 43%
    compared to  $79.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    44 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big, Regular
    REI OUTLET
    Arc'teryxRho LT Base Layer Bottoms - Men's
    $59.83 - $100.00
    63 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes
    $49.93
    Save 37%
    compared to  $79.95
    17 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Tall, Big
    SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's
    $85.00
    5 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    SmartwoolIntraknit Thermal Merino Base Layer 3/4 Bottoms - Men's
    $89.73
    Save 25%
    compared to  $120.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    REI OUTLET
    Helly HansenLIFA Base Layer Pants - Men's
    $45.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Arc'teryxRho Base Layer Bottoms - Women's
    $49.83 - $75.93
    40 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Free CountryCloud Knit Base Layer Bottoms - Men's
    $20.73
    Save 48%
    compared to  $40.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    3 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Big
    REI OUTLET
    Free CountryMicrotech Heat Base Layer Bottoms - Women's
    $29.73
    Save 29%
    compared to  $42.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaFryd Base Layer Pants - Women's
    $40.73 - $49.73
    Save 23% - 32%
    compared to  $60.00 - $65.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    19 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Ortovox185 Rock'N'Wool Short Base Layer Pants - Men's
    $100.00 - $110.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
    $92.73
    Save 28%
    compared to  $130.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    30 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    HalfdaysSophia Base Layer Leggings - Women's
    $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 - Men's
    $150.00
    35 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Big
    Kari TraaAlma Pants - Women's
    $68.73
    Save 23%
    compared to  $90.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    0 reviews
    Underwear Weight:
    Ultralightweight
    Size Type:
    Regular
    REI OUTLET
    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
    New arrival
    REI Co-opLightweight Base Layer Bottoms - Infants'/Toddlers'
    $19.95
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    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
    Kari TraaLucie Base Layer Pants - Women's
    $55.73
    Save 30%
    compared to  $80.00
    Members use code OUT4JUL26 for $20 off $100+ at REI Outlet thru 7/6.
    6 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
1–30 of 45 products
Sort: Best Match