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Base Layer Tops

(206 products)

Products (206)

Sort: Best Match

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
Kari TraaSval Long-Sleeve Base Layer Top - Women's
$39.83
Save 50%
compared to $80.00
3 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
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
6 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
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
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
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
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
Top Rated
Wild RyeHailey Half-Zip Base Layer Top - Women's
$66.83
Save 50%
compared to $135.00
7 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
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
Top Rated
Icebreaker125 ZoneKnit Merino Long-Sleeve Crewe Thermal Top - Men's
$93.73
Save 25%
compared to $125.00
6 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Ultralightweight
Size Type:
Regular, Big
REI OUTLET
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
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
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
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
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
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 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
SmartwoolIntraknit Thermal Merino Pattern Crew Base Layer Top - Women's
$96.73
Save 25%
compared to $130.00
48 reviews with an average rating of 4.4 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
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.73
Save 25%
compared to $115.00
273 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
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
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
Helly HansenLIFA Merino Midweight 2-In-1 Graphic Half-Zip Base Layer Top - Women's
$86.73 - $89.73
Save 25% - 27%
compared to $120.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Kari TraaFaith Half-Zip Base Layer Top - Women's
$59.83
Save 50%
compared to $120.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
Terramar1.0 All-Season Lightweight Merino Wool T-Shirt - Women's
$34.73
Save 30%
compared to $50.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Free CountryMicrotech Heat Cocaber Base Layer Top - Women's
$34.73
Save 30%
compared to $50.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$84.83
Save 29%
compared to $120.00
27 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big, Regular
SmartwoolClassic All-Season Merino T-Shirt - Women's
$55.93 - $59.99
Save 25% - 30%
compared to $80.00
70 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus

1–30 of 206 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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