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REI Co-op Merino Wool Underwear

(29 products)

Products (29)

Sort: Best Match

Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$39.83 - $79.95
175 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$49.83 - $89.95
102 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 Top - Women's
$48.93 - $69.95
49 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$79.95
199 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$62.93 - $89.95
101 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opMerino 185 Base Layer Bottoms - Men's
$79.95
129 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Bottoms - Women's
$79.95
105 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opMerino 185 Base Layer Top - Men's
$69.95
53 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
REI Co-opMerino 185 Base Layer Top - Women's Plus Sizes
$48.93 - $69.95
21 reviews with an average rating of 4.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$99.95
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95
23 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Top Rated
REI Co-opHeavyweight Merino Base Layer Bottoms - Women's
$99.95
18 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's Plus Sizes
$39.83 - $79.95
28 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Plus
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$49.95
25 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$99.95
7 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
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
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
Top Rated
REI Co-opHeavyweight Merino Base Layer Half-Zip Top - Women's
$104.95
20 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's Plus Sizes
$49.83 - $89.95
18 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
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
REI Co-opMerino Boxer Briefs - Men's
$39.95
103 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Big
REI Co-opMerino Bikini Underwear - Women's
$27.95
49 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Regular, Plus
REI Co-opMerino Boxers - Men's
$39.95
66 reviews with an average rating of 4.3 out of 5 stars
Size Type:
Regular, Big
REI Co-opMerino Hipster Underwear - Women's
$29.95
47 reviews with an average rating of 4.0 out of 5 stars
Size Type:
Regular, Plus
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
Top Rated
REI Co-opMerino Bralette
$44.95
151 reviews with an average rating of 4.6 out of 5 stars
Bra Support:
Low Impact
Support Style:
Encapsulation
Fabric:
48% merino wool/32% TENCEL lyocell/15% nylon/5% LYCRA spandex
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
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's Tall Sizes
$89.95
13 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Tall, Big
REI Co-opMerino Thong Underwear - Women's
$24.95
33 reviews with an average rating of 4.2 out of 5 stars
Size Type:
Plus

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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