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Lightweight Base Layers

(118 products)

Products (118)

Sort: Best Match

REI Co-opMerino 185 Base Layer Bottoms - Men's
$39.83 - $55.89
Save 30% - 50%
compared to $79.95
124 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends May 26
Top Rated
REI Co-opLightweight Base Layer Bottoms - Men's
$27.89
Save 30%
compared to $39.95
6 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big, Tall
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
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
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
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
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
Sale Ends May 26
SmartwoolClassic All-Season Merino T-Shirt - Men's
$59.99
Save 25%
compared to $80.00
54 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends May 26
REI Co-opMerino 185 Base Layer Bottoms - Women's
$55.89
Save 30%
compared to $79.95
103 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
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
Sale Ends May 26
SmartwoolIntraknit Active Base Layer Bottoms - Women's
$82.49
Save 25%
compared to $110.00
5 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
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
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
Arc'teryxLana Merino Wool Crew Base Layer Top - Women's
$90.00
5 reviews with an average rating of 2.2 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 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 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
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$39.83 - $55.89
Save 30% - 50%
compared to $79.95
8 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Arc'teryxRho Base Layer Bottoms - Women's
$70.83 - $100.00
27 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Arc'teryxLana Merino Wool Base Layer Tank Top - Women's
$90.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
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
Arc'teryxRho LT Base Layer Bottoms - Men's
$70.83 - $100.00
46 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
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
Helly HansenHH Durawool T-Shirt - Women's
$80.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
Arms of Andes300 Lightweight Alpaca Wool Base Layer Leggings - Men's
$105.00
12 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
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 HansenHH Durawool Crew Long-Sleeve Base Layer - Women's
$90.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular

1–30 of 118 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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