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Long Sleeve Women's Underwear

(132 products)

Products (132)

Sort: Best Match

REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$26.83 - $38.39
Save 30% - 51%
compared to $54.95
249 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$19.83 - $41.89
Save 30% - 66%
compared to $59.95
140 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$44.83 - $90.00
121 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends Sep 1
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$27.89
Save 30%
compared to $39.95
19 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$39.83 - $89.95
102 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$81.73
Save 28%
compared to $115.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
367 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$115.00
1149 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$49.83 - $105.00
135 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
$120.00
30 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Kari TraaFryd Base Layer Top - Women's
$29.83 - $65.00
21 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$79.95
199 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Kari TraaRose Half-Zip Base Layer Top - Women's
$59.83 - $140.00
30 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends Sep 1
REI Co-opLightweight Half-Zip Base Layer Top - Women's
$31.39
Save 30%
compared to $44.95
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Terramar2.0 Cloud Nine Half-Zip Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$79.95
29 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's
$89.73
Save 25%
compared to $120.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
Arc'teryxRho Zip-Neck Base Layer Top - Women's
$79.93 - $120.00
11 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Nani SwimwearUinta Base Layer Top - Women's
$19.83
Save 75%
compared to $80.00
13 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's
$39.83 - $90.00
0 reviews
Underwear Weight:
Ultralightweight
Size Type:
Regular
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$78.73
Save 25%
compared to $105.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
135 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular, Plus
REI OUTLET
SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's
$39.83
Save 63%
compared to $110.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$59.93 - $89.00
45 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$99.95
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$96.73
Save 25%
compared to $130.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
120 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's
$82.73
Save 28%
compared to $115.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
Black DiamondSolution 150 Merino Base Layer Crew Top - Women's
$99.73
Save 26%
compared to $135.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
20 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$99.73
Save 26%
compared to $135.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
26 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$84.73
Save 26%
compared to $115.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
20 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
CraftCORE Dry Active Comfort Base Layer Top - Women's
$39.73
Save 38%
compared to $64.95
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
4 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Kari TraaLucie Half-Zip Base Layer Top - Women's
$67.73
Save 24%
compared to $90.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET

1–30 of 132 products

Sort: Best Match

Related Expert Advice articles

What material is best?

Wool is moisture-wicking and odor-resistant, while synthetic fabrics are more durable and less expensive.

Match the temp to the trek

Lightweight layers are best for moderate to cool temperatures. Midweight layers are best for cold temperatures. Heavyweight layers are best for below-freezing temperatures.

Find your fit

To be able to wick sweat efficiently, your next-to-skin layer needs to actually be next to your skin. A comfortably snug fit everywhere is your goal.

Read full article: How to Choose Base Layers

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