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Underwear

(633 products)

Products (633)

Sort: Best Match

Top Rated
PatagoniaCapilene Midweight Crew Base Layer Top - Women's
$43.83 - $89.00
45 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opLightweight Crew Base Layer Top - Toddlers'
$19.95
13 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
PatagoniaCapilene Thermal Weight Zip-Neck Top - Men's
$109.00
21 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$99.73
Save 26%
compared to $135.00
28 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI OUTLET
REI Co-opMerino 185 Base Layer Top - Women's
$69.95
53 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Arc'teryxKyanite Base Layer Bottoms - Women's
$96.73
Save 19%
compared to $120.00
3 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Kari TraaFryd Base Layer Top - Women's
$29.83 - $65.00
24 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Bottoms - Toddlers'
$19.95
11 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$104.95
21 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
New arrival
Free CountryCloud Knit Crewneck Base Layer Top - Men's
$26.73
Save 33%
compared to $40.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's Tall Sizes
$79.95
8 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
CraftCORE Dry Active Comfort Base Layer Top - Women's
$39.73
Save 38%
compared to $64.95
4 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
REI Co-opEveryday Boxers - Men's
$22.95
123 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$44.73 - $46.73
Save 28% - 31%
compared to $65.00
5 reviews with an average rating of 3.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opMerino Midweight Base Layer Bottoms - Kids'
$49.95
15 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolClassic All-Season Merino T-Shirt - Women's
$80.00
90 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$49.95
26 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's
$78.73
Save 25%
compared to $105.00
76 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Free CountryForce Grid Fleece Base Layer Bottoms - Women's
$34.73
Save 36%
compared to $55.00
3 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
27 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Helly HansenLIFA Merino Midweight Crew Base Layer Top - Women's
$69.73
Save 30%
compared to $100.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
SmartwoolClassic All Season Merino Long-Sleeve Base Layer Top - Men's
$66.73
Save 25%
compared to $90.00
68 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$65.00
80 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opActive Bikini Underwear - Women's
$19.95
53 reviews with an average rating of 3.4 out of 5 stars
Size Type:
Regular, Plus
SmartwoolClassic All-Season Merino Base Layer Bottoms - Women's
$90.00
16 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$104.95
15 reviews with an average rating of 3.9 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$85.73
Save 25%
compared to $115.00
277 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$105.00
145 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opActive Briefs - Women's
$17.95
38 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Plus
Helly HansenLIFA Merino Midweight 2-In-1 Base Layer Pants - Women's
$69.73
Save 30%
compared to $100.00
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET

61–90 of 633 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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