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

The top brands for women's base layer tops include: Icebreaker Kari Traa Smartwool REI Co-op 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 143 results

Women's Base Layer Tops

(143 products)

Products (143)

Sort: Best Match

Sale Ends Nov 25
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$41.89
Save 30%
compared to $59.95
112 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$26.83 - $38.39
Save 30% - 51%
compared to $54.95
204 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends Nov 25
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$86.19
Save 25%
compared to $115.00
1096 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends Nov 25
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$55.89
Save 30%
compared to $79.95
174 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$53.83 - $67.49
Save 25% - 40%
compared to $90.00
89 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$62.83 - $78.69
Save 25% - 40%
compared to $105.00
65 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends Nov 25
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$62.89
Save 30%
compared to $89.95
88 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends Nov 25
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$73.39
Save 30%
compared to $104.95
6 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Sale Ends Nov 25
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$69.89
Save 30%
compared to $99.95
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI Co-opLightweight Base Layer Long-Sleeve Crew Top - Women's
$27.93
Save 30%
compared to $39.95
175 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Half-Zip Top - Women's
$29.93
Save 33%
compared to $44.95
79 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends Nov 25
IcebreakerMerino 260 Vertex Long-Sleeve Half-Zip Herenga Base Layer Top - Women's
$112.49
Save 25%
compared to $150.00
6 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Sale Ends Nov 25
REI Co-opMerino 185 Base Layer Top - Women's
$48.89
Save 30%
compared to $69.95
30 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends Nov 25
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$89.99
Save 25%
compared to $120.00
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
tasc PerformanceElevation Merino T-Shirt - Women's
$54.73
Save 30%
compared to $79.00
60 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$23.83 - $55.89
Save 30% - 70%
compared to $79.95
25 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Sale Ends Nov 25
Kari TraaFryd Base Layer Top - Women's
$44.99
Save 25%
compared to $60.00
19 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Nov 25
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Cloud Dye Base Layer Top - Women's
$86.19
Save 25%
compared to $115.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Nov 25
Top Rated
REI Co-opMerino Base Layer Tank Top - Women's
$34.89
Save 30%
compared to $49.95
21 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends Nov 25
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$62.89
Save 30%
compared to $89.95
15 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Free CountryForce Grid Fleece Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$99.00
27 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Nov 25
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$93.69
Save 25%
compared to $125.00
15 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
New arrival
HalfdaysJohnson Base Layer Top - Women's
$85.00
57 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular, Plus
Sale Ends Nov 25
Kari TraaSara Half-Zip Base Layer Top - Women's
$82.49
Save 25%
compared to $110.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Kari TraaLune Long-Sleeve 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:
Heavyweight
Size Type:
Regular
REI OUTLET
Kari TraaJuliane Wool Half-Zip Base Layer Top - Women's
$104.73
Save 25%
compared to $140.00
2 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Free CountryMicrotech Heat Cocaber Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
Arc'teryxRho Lightweight Crew Neck Long-Sleeve Base Layer Top - Women's
$70.83
Save 29%
compared to $100.00
31 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Kari TraaSummer Wool Long-Sleeve Base Layer Top - Women's
$56.73
Save 29%
compared to $80.00
1 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET