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Long Sleeve Underwear

(182 products)

Products (182)

Sort: Best Match

Sale Ends May 26
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$86.19
Save 25%
compared to $115.00
1505 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$62.93 - $67.49
Save 25% - 30%
compared to $90.00
105 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Kari TraaFryd Base Layer Top - Women's
$29.83 - $41.99
Save 30% - 50%
compared to $60.00
22 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$83.93 - $89.99
Save 25% - 30%
compared to $120.00
26 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$89.00
45 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends May 26
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$38.39
Save 30%
compared to $54.95
239 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends May 26
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$78.69
Save 25%
compared to $105.00
123 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$70.83 - $100.00
27 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Men's
$89.00
80 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Arc'teryxIonia Merino Wool Base Layer Hoody - Men's
$140.00
49 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's
$135.00
15 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$44.83 - $62.89
Save 30% - 50%
compared to $89.95
16 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Men's
$85.00
11 reviews with an average rating of 3.4 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular, Big
Top Rated
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Men's
$99.00
61 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Women's
$115.00 - $135.00
8 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
$109.00
18 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Arms of Andes300 Alpaca Wool Long-Sleeve Crew Base Layer Top - Men's
$130.00
7 reviews with an average rating of 3.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Arc'teryxRho Zip-Neck Base Layer Top - Women's
$120.00
35 reviews with an average rating of 4.8 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
$44.83 - $62.89
Save 30% - 50%
compared to $89.95
96 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$49.83 - $73.39
Save 30% - 52%
compared to $104.95
18 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$69.83 - $104.99
Save 25% - 50%
compared to $140.00
10 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI Co-opMidweight Base Layer Half-Zip Top - Women's
$29.83 - $41.89
Save 30% - 50%
compared to $59.95
134 reviews with an average rating of 4.4 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
$49.83 - $73.39
Save 26% - 50%
compared to $99.95
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
PatagoniaCapilene Thermal Weight Long Underwear Crew Top - Men's
$99.00
10 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
PatagoniaCapilene Midweight Zip-Neck Base Layer Top - Women's
$99.00
28 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$79.93 - $86.19
Save 25% - 30%
compared to $115.00
1151 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$49.83 - $73.39
Save 30% - 52%
compared to $104.95
14 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Sale Ends May 26
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$67.49
Save 25%
compared to $90.00
56 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
PatagoniaCapilene Thermal Weight Zip-Neck Long Underwear Top - Women's
$109.00
14 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Ortovox230 Competition Zip-Neck Base Layer Top - Men's
$120.00
3 reviews with an average rating of 3.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big

1–30 of 182 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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