Skip to search results
loaded 28 results

Women's Lightweight Base Layer Bottoms

(28 products)
Products (28)
Sort: Best Match
    REI Co-opMerino 185 Base Layer Bottoms - Women's
    $84.95
    1 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Petite, Regular, Plus
    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
    Terramar1.0 All Season Merino Base Layer Pants - Women's
    $36.73
    Save 33%
    compared to  $55.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    1 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaRose High-Waist Base Layer Pants - Women's
    $89.97
    Save 30%
    compared to  $130.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    25 reviews with an average rating of 4.4 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
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    15 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 - Women's
    $44.73
    Save 43%
    compared to  $79.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    68 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaRose High-Waisted Base Layer Pants - Women's
    $59.83 - $130.00
    25 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $100.00
    28 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    PatagoniaCapilene Lightweight Base Layer Bottoms - Women's
    $75.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
    $66.73
    Save 25%
    compared to  $90.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    27 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Arc'teryxSatoro Merino Wool Base Layer Bottoms - Women's
    $95.73
    Save 20%
    compared to  $120.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    17 reviews with an average rating of 3.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    New arrival
    Arc'teryxRho Base Layer Bottoms - Women's
    $100.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Kari TraaLekker Base Layer Pants - Women's
    $49.73
    Save 23%
    compared to  $65.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Free CountryMicrotech Heat Cocarber Base Layer Bottoms - Women's - Package of 2
    $42.73
    Save 18%
    compared to  $52.50
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    12 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Kari TraaFryd Base Layer Pants - Women's
    $40.73 - $49.73
    Save 23% - 32%
    compared to  $55.00 - $65.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    19 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Kari TraaSval Base Layer Pants - Women's
    $48.73
    Save 30%
    compared to  $70.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    2 reviews with an average rating of 3.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaLucie Base Layer Pants - Women's
    $55.73
    Save 30%
    compared to  $80.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    6 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Black DiamondCoefficient LT Base Layer Bottoms - Women's
    $76.73
    Save 40%
    compared to  $129.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    HalfdaysSophia Base Layer Leggings - Women's
    $49.83
    Save 47%
    compared to  $95.00
    124 reviews with an average rating of 4.5 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Kari TraaFierce Base Layer Pants - Women's
    $45.73
    Save 30%
    compared to  $66.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    Black DiamondSolution 150 Merino Base Layer Bottoms - Women's
    $79.73
    Save 27%
    compared to  $110.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    34 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    New arrival
    SENIQWarmup Merino Base Layer Leggings - Women's
    $118.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Kari TraaMina Base Layer Pants - Women's
    $41.73
    Save 30%
    compared to  $60.00
    Use code OUTSEPT26 to save $30 off $150+ at REI Outlet thru 9/21
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    New arrival
    HalfdaysClare Lightweight Merino Base Layer Leggings - Women's
    $115.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
  • The R E I Co-op Mastercard. Earn 15% total R E I rewards.

    Earn 15% in Total REI Rewards

    Get 5% card rewards on all REI Co‑op purchases plus the 10% Co-op Member Reward you earn on eligible full-price purchases. Terms apply.

    New arrival
    HalfdaysClare Capri Base Layer Bottoms - Women's
    $95.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Arc'teryxRho Base Layer Bottoms - Women's
    $49.83
    Save 50%
    compared to  $100.00
    43 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    RHONEApres Houndstooth Seamless Base Layer Leggings - Women's
    $50.83
    Save 60%
    compared to  $128.00
    3 reviews with an average rating of 4.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Wild RyeBassett LITE Base Layer Leggings - Women's
    $29.83
    Save 66%
    compared to  $89.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
Sort: Best Match
Illustration of a hand holding a phone.

Checkout faster

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

Get the REI app