What are some popular brands for women's base layer tops at REI?

The top brands for women's base layer tops include: Smartwool Kari Traa REI Co-op Icebreaker Helly Hansen Browse our selection of top outdoor gear and apparel brands.

How can I earn a Co-op Member Reward on my women's base layer tops purchase?

REI Co-op Members get 10% back annually on every eligible purchase, including most full-priced women's base layer tops. (10% is typical but not guaranteed.) To earn or redeem rewards, buy a one-time $30 lifetime membership, or sign in as a member. See details about the Co-op Member Reward .

loaded 90 results

Women's Base Layer Tops

(90 products)

Products (90)

Sort: Best Match

SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$49.83 - $74.99
Save 25% - 50%
compared to $100.00
100 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$41.19
Save 25%
compared to $54.95
324 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$33.69
Save 25%
compared to $44.95
38 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$93.69
Save 25%
compared to $125.00
1222 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$49.83 - $97.49
Save 25% - 61%
compared to $130.00
72 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Plus, Regular
Save 25% on all Smartwool clothing

Shop now
Sale Ends May 25
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$59.89
Save 25%
compared to $79.95
246 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$49.83 - $112.49
Save 25% - 66%
compared to $150.00
199 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 25
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$44.89
Save 25%
compared to $59.95
197 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$37.39
Save 25%
compared to $49.95
16 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
SmartwoolClassic All-Season Merino T-Shirt - Women's
$59.99 - $71.19
Save 25% - 36%
compared to $95.00
110 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
REI Co-opMerino 185 Base Layer Top - Women's
$52.39
Save 25%
compared to $69.95
67 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends May 25
Top Rated
REI Co-opLightweight Crew Base Layer Top - Women's
$26.19
Save 25%
compared to $34.95
30 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 25
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$67.39
Save 25%
compared to $89.95
112 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends May 25
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$89.99
Save 25%
compared to $120.00
185 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$69.73
Save 26%
compared to $95.00
6 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$29.83 - $104.95
35 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$81.73 - $84.73
Save 26% - 28%
compared to $115.00
440 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$89.00
Add to cart to see price
52 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
SmartwoolIntraknit Thermal Merino Colorblock Quarter-Zip Base Layer Top - Women's
$49.83 - $104.99
Save 25% - 64%
compared to $140.00
8 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 25
Icebreaker125 Cool-Lite Merino Blend Sphere III Scoop T-Shirt - Women's
$67.49
Save 25%
compared to $90.00
28 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
tasc PerformanceElevation Merino T-Shirt - Women's
$46.73
Save 40%
compared to $79.00
95 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$29.83 - $99.95
45 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's
$89.73
Save 25%
compared to $120.00
72 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Arc'teryxKyanite Base Layer Crew Top - Women's
$95.73
Save 20%
compared to $120.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Sale Ends May 25
Kari TraaAnna Half-Zip Base Layer Top - Women's
$83.99
Save 30%
compared to $120.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 25
Top Rated
Kari TraaEdith Half-Zip Base Layer Top - Women's
$57.19
Save 48%
compared to $110.00
12 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
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Get $130 in value

When approved for the REI Co-op Mastercard by May 25, you’ll get $30 in card rewards. Plus, you can earn a $100 REI gift card after your first non-REI purchase within 60 days from account opening. Terms apply.
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Sale Ends May 25
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women's
$86.19 - $97.49
Save 25%
compared to $115.00 - $130.00
42 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
Arc'teryxRho Base Layer Hoody - Women's
$95.73
Save 20%
compared to $120.00
25 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends May 25
SmartwoolIntraknit AS Merino Base Layer Crew Top - Women's
$93.69
Save 25%
compared to $125.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Helly HansenHH Durawool Base Layer T-Shirt - Women's
$56.73
Save 29%
compared to $80.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET