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Lightweight Base Layers

(144 products)

Products (144)

Sort: Best Match

Free CountryMicrotech Heat Cocarber Base Layer Top - Women's
$39.73
Save 33%
compared to $60.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's
$75.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Arc'teryxRho Merino Wool Base Layer Bottoms - Men's
$120.00
5 reviews with an average rating of 3.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
$92.73
Save 28%
compared to $130.00
28 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Men's Tall Sizes
$79.95
13 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
Kari TraaMina Base Layer Pants - Women's
$42.73
Save 28%
compared to $60.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
Arc'teryxRho LT Crew Neck Base Layer Top - Men's
$79.73
Save 20%
compared to $100.00
29 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
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
New arrival
Arc'teryxLana Merino Wool Base Layer Tank Top - Women's
$64.73
Save 19%
compared to $80.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
IcebreakerMerino 125 ZoneKnit Long-Sleeve Half-Zip Base Layer Top - Men's
$99.73
Save 26%
compared to $135.00
11 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Kari TraaEloise Base Layer Pants - Women's
$52.73
Save 24%
compared to $70.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Free CountryCloud Knit Base Layer Bottoms - Women's
$31.73
Save 29%
compared to $45.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Free CountryMicrotech Heat Cocarber 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
SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
$66.73
Save 25%
compared to $90.00
16 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
REI OUTLET
Top Rated
Outdoor ResearchAlpine Onset Merino 150 Base Layer Hoodie - Men's
$119.00
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Kari TraaFryd Half-Zip Base Layer Top - Women's
$49.73
Save 24%
compared to $66.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
REI Co-opMerino 185 Base Layer Bottoms - Women's Plus Sizes
$79.95
9 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Helly HansenVerglas Half-Zip Top - Women's
$63.73
Save 25%
compared to $85.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
KUHLReactiv Lite Grid Long-Sleeve Crew Base Layer Top - Men's
$109.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$89.95
18 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Hot ChillysPeach Skins Crew Base Layer Top- Kids'
$29.73
Save 33%
compared to $45.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
$69.95
22 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Arms of Andes300 Lightweight Alpaca Wool Half-Zip Base Layer Top - Men's
$145.00
14 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Ortovox185 Rock'N'Wool Long-Sleeve Base Layer Top - Men's
$120.00 - $130.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Outdoor ResearchAlpine Onset Merino 150 Crew Base Layer Top - Men's
$99.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Men's
$84.73
Save 26%
compared to $115.00
6 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Hot ChillysPeach Skins T-Neck Base Layer Top - Kids'
$32.73
Save 34%
compared to $50.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Free CountryMicrotech Heat Cocarber Base Layer Bottoms - Women's
$34.73
Save 30%
compared to $50.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Outdoor ResearchAlpine Onset Merino 150 Base Layer Bottoms - Men's
$99.00
11 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Ortovox120 Comp Light Short Base Layer Pants - Men's
$70.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular

61–90 of 144 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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