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Long Sleeve Base Layers

(182 products)

Products (182)

Sort: Best Match

Sale Ends May 26
Top Rated
REI Co-opMidweight Long-Sleeve Base Layer Top - Men's
$38.39
Save 30%
compared to $54.95
150 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
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
REI Co-opMidweight Base Layer Half-Zip Top - Men's
$41.89
Save 30%
compared to $59.95
133 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big, Tall
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
Sale Ends May 26
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$27.89
Save 30%
compared to $39.95
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
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
Sale Ends May 26
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$55.89
Save 30%
compared to $79.95
172 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
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
Top Rated
tasc PerformanceElevation Merino T-Shirt - Women's
$49.73
Save 37%
compared to $79.00
75 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
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
Sale Ends May 26
Top Rated
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Women's
$27.89
Save 30%
compared to $39.95
7 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends May 26
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$55.89
Save 30%
compared to $79.95
194 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
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
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
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
Sale Ends May 26
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$62.89
Save 30%
compared to $89.95
103 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
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-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$49.83 - $99.95
21 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
PatagoniaCapilene Midweight Crew Base Layer Top - Kids'
$26.93
Save 30%
compared to $39.00
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
$89.00
45 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
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
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
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 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
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
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
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
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
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-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
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
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
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
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
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
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women's
$66.83 - $101.19
Save 25% - 50%
compared to $135.00
24 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Arc'teryxRho LT Zip-Neck Base Layer Top - Men's
$84.83 - $120.00
90 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$61.83 - $93.69
Save 25% - 50%
compared to $125.00
34 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Helly HansenHH Durawool Crew Long-Sleeve Base Layer - Women's
$90.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
Ortovox230 Competition Long-Sleeve Base Layer Top - Men's
$110.00
2 reviews with an average rating of 3.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Kari TraaRose Half-Zip Base Layer Top - Women's
$59.83 - $83.99
Save 30% - 50%
compared to $120.00
48 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Arms of Andes300 Lightweight Alpaca Wool Pullover Base Layer Hoodie - Women's
$140.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$64.83 - $97.49
Save 25% - 50%
compared to $130.00
188 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Arms of Andes160 Ultralight Alpaca Wool Long-Sleeve Base Layer Shirt - Women's
$85.00 - $100.00
11 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular
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
Sale Ends May 26
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$71.19
Save 25%
compared to $95.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 26
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
Sale Ends May 26
REI Co-opLightweight Half-Zip Base Layer Top - Men'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, Big, Tall
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
IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'
$41.93 - $44.99
Save 25% - 30%
compared to $60.00
8 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 26
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$71.19
Save 25%
compared to $95.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
Sale Ends May 26
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.69
Save 25%
compared to $105.00
122 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 26
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$89.99
Save 25%
compared to $120.00
15 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 26
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$93.69
Save 25%
compared to $125.00
58 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Sale Ends May 26
SmartwoolIntraknit Active Long-Sleeve 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:
Midweight
Size Type:
Regular
Sale Ends May 26
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$55.89
Save 30%
compared to $79.95
26 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Sale Ends May 26
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's
$101.19
Save 25%
compared to $135.00
34 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 26
Kari TraaEmbla Wool Long-Sleeve Base Layer Top - Women's
$55.99
Save 30%
compared to $80.00
0 reviews
Underwear Weight:
Ultralightweight
Size Type:
Regular
Sale Ends May 26
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$86.19
Save 25%
compared to $115.00
17 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 26
Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Top - Men's
$93.69
Save 25%
compared to $125.00
4 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends May 26
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$24.39
Save 30%
compared to $34.95
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 26
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$34.89
Save 30%
compared to $49.95
25 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends May 26
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$97.49
Save 25%
compared to $130.00
189 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
The North FaceSummit Series Pro 120 Crew Base Layer Top - Women's
$100.00
12 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular, Plus
Sale Ends May 26
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes
$55.89
Save 30%
compared to $79.95
8 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall
Ortovox185 Merino Rock'n'wool Long-Sleeve Base Layer Top - Men's
$87.99 - $110.00
10 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends May 26
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes
$62.89
Save 30%
compared to $89.95
13 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall
Sale Ends May 26
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women's
$86.19
Save 25%
compared to $115.00
16 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends May 26
Top Rated
REI Co-opLightweight Crew Base Layer Top - Infants'/Toddlers'
$13.89
Save 30%
compared to $19.95
10 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Crew Base Layer Top - Toddlers'
$17.39 - $24.95
14 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Ortovox120 Comp Light Base Layer Hoody - Men's
$95.99 - $120.00
2 reviews with an average rating of 5.0 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
365 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Women's
$89.73
Save 25%
compared to $120.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Helly HansenLIFA Merino Midweight Balaclava Base Layer Hoodie - Men's
$104.73
Save 30%
compared to $150.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends May 26
Top Rated
REI Co-opLightweight Base Layer Crew Top - Kids'
$20.89
Save 30%
compared to $29.95
12 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Free CountryMicrotech Heat Cocaber Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big
REI OUTLET
Free CountryForce Grid Fleece Base Layer Top - Men's
$29.73
Save 33%
compared to $45.00
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big
REI OUTLET
Free CountryMicrotech Heat Base Layer Top - Men's
$28.73
Save 36%
compared to $45.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Big
REI OUTLET
Sale Ends May 26
Kari TraaLune Long-Sleeve Base Layer Top - Women's
$44.73
Save 31%
compared to $65.00
2 reviews with an average rating of 3.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Lettuce Edge Crew Base Layer Top - Women's
$82.73
Save 28%
compared to $115.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
Free CountryForce Grid Fleece Crew Base Layer Top - Men's
$31.73
Save 29%
compared to $45.00
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big
REI OUTLET
Top Rated
CotopaxiLiso Base Layer Top - Men's
$48.73
Save 25%
compared to $65.00
37 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
ArtilectGoldhill 125 Zoned Crew Base Layer Top - Men's
$89.73
Save 30%
compared to $130.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
tasc PerformanceElevation Merino T-Shirt - Men's
$49.73
Save 37%
compared to $79.00
38 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Sale Ends May 26
Kari TraaRose Light Half-Zip Base Layer Top - Women's
$83.73
Save 30%
compared to $120.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends May 26
Kari TraaMalia Long-Sleeve Base Layer Top - Women's
$48.73
Save 30%
compared to $70.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Free CountryForce Grid Fleece Base Layer Top - Women's
$34.73
Save 36%
compared to $55.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET

1–90 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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