Skip to search results
loaded 43 results

Women's Lightweight Base Layer Tops

(43 products)
Products (43)
Sort: Best Match
    Top Rated
    REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
    $44.95
    49 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI Co-opMerino 185 Long-Sleeve Crew Base Layer Top - Women's
    $84.95
    1 reviews with an average rating of 3.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI Co-opMerino 185 Crew Base Layer Top - Women's
    $74.95
    3 reviews with an average rating of 5.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI Co-opMerino 185 Half-Zip Base Layer Top - Women's
    $89.95
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opLightweight Half-Zip Base Layer Top - Women's
    $49.95
    20 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    REI Co-opLightweight Crew Base Layer Top - Women's
    $34.95
    42 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
    $100.00
    111 reviews with an average rating of 4.4 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    SmartwoolClassic All-Season Merino T-Shirt - Women's
    $95.00
    106 reviews with an average rating of 4.2 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Top Rated
    Arc'teryxSatoro Merino Wool Crew Neck Long-Sleeve Base Layer Top - Women's
    $95.73
    Save 20%
    compared to  $120.00
    19 reviews with an average rating of 4.7 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    New arrival
    Outdoor ResearchAlpine Onset Merino 150 Half-Zip Base Layer Top - Women's
    $74.97
    Save 31%
    compared to  $109.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Terramar1.0 All Season Merino Crew Base Layer Top - Women's
    $36.73
    Save 33%
    compared to  $55.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    PatagoniaCapilene Lightweight Crew Base Layer Top - Women's
    $75.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    PatagoniaCapilene Lightweight Zip-Neck Base Layer Top - Women's
    $85.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Kari TraaFryd Long-Sleeve Base Layer Top - Women's
    $49.73
    Save 23%
    compared to  $65.00
    29 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Top Rated
    Black DiamondSolution 150 Merino Base Layer Crew Top - Women's
    $89.73
    Save 33%
    compared to  $135.00
    23 reviews with an average rating of 4.9 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenHH Durawool High Neck Long-Sleeve Base Layer Top - Women's
    $74.73
    Save 25%
    compared to  $100.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Kari TraaSmekker Half-Zip Base Layer Top - Women's
    $140.00
    23 reviews with an average rating of 4.1 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    New arrival
    Arc'teryxRho Zip Neck Base Layer Top - Women's
    $120.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    New arrival
    Arc'teryxRho Hoody Base Layer Top - Women's
    $120.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Kari TraaLekker Long-Sleeve Base Layer Top - Women's
    $44.73
    Save 31%
    compared to  $65.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    New arrival
    HalfdaysClare Lightweight Merino Base Layer Top - Women's
    $115.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Top Rated
    Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women's
    $130.00
    55 reviews with an average rating of 4.8 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    Kari TraaIselin Long-Sleeve Base Layer Top - Women's
    $44.73
    Save 31%
    compared to  $65.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Helly HansenLIFA ACTIVE Stripe Crew Base Layer Top - Women's
    $48.73
    Save 25%
    compared to  $65.00
    1 reviews with an average rating of 1.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
  • 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.

    Kari TraaSmekker Long-Sleeve Base Layer Top - Women's
    $130.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's
    $86.73
    Save 30%
    compared to  $125.00
    4 reviews with an average rating of 4.0 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    New arrival
    Outdoor ResearchAlpine Onset Merino 150 Base Layer Hoodie - Women's
    $82.97
    Save 30%
    compared to  $119.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular, Plus
    REI OUTLET
    Top Rated
    SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
    $69.73
    Save 26%
    compared to  $95.00
    9 reviews with an average rating of 4.6 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    REI OUTLET
    Arc'teryxLana Merino Wool Crew Base Layer Top - Women's
    $63.93
    Save 28%
    compared to  $90.00
    10 reviews with an average rating of 3.3 out of 5 stars
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
    New arrival
    Arc'teryxRho Crew Neck Long-Sleeve Base Layer Top - Women's
    $100.00
    0 reviews
    Underwear Weight:
    Lightweight
    Size Type:
    Regular
1–30 of 43 products
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