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Merino Wool Underwear

(270 products)

Products (270)

Sort: Best Match

REI Co-opMerino 185 Base Layer Bottoms - Men's
$39.83 - $79.95
124 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Staff Pick
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$79.93 - $115.00
1505 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Kari TraaEmbla Wool Boxer Briefs - Women's
$40.00
0 reviews
Size Type:
Regular
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$62.93 - $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 Quarter-Zip Base Layer Top - Women's
$83.93 - $120.00
25 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Men's
$49.83 - $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-opMerino Boxers - Men's
$39.95
65 reviews with an average rating of 4.3 out of 5 stars
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$79.93 - $115.00
1151 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
SmartwoolIntraknit Crop Bra
$51.73
Save 26%
compared to $70.00
9 reviews with an average rating of 3.3 out of 5 stars
Bra Support:
Low Impact
Support Style:
Compression
Fabric:
62% nylon/28% elastane/10% polyester (exclusive of decoration)
REI OUTLET
Helly HansenMerino Wool Base Layer Set - Kids'
$82.73
Save 31%
compared to $120.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$79.95
169 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's
$115.00
734 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$79.95
193 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$89.95
103 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Bottoms - Women's
$79.95
103 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Men's
$95.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
50 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Base Layer Bottoms - Men's
$90.00
18 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$115.00
615 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$125.00
57 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$97.93 - $140.00
10 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$95.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
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
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$44.83 - $89.95
16 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$95.00
29 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Icebreaker125 ZoneKnit Base Layer Leggings - Men's
$125.00
0 reviews
Underwear Weight:
Ultralightweight
Size Type:
Regular, Big
SmartwoolIntraknit Active Long-Sleeve Base Layer Top - Women's
$110.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's Plus Sizes
$115.00 - $120.00
19 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Plus
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
66 reviews with an average rating of 4.4 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

1–30 of 270 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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