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Merino Wool Base Layers

(272 products)

Products (272)

Sort: Best Match

Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$115.00
1171 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's
$115.00
743 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Dec 8
Top Rated
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Men's
$55.89
Save 30%
compared to $79.95
195 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$120.00
37 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$115.00
627 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$120.00
36 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$115.00
1511 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends Dec 8
REI Co-opMerino 185 Base Layer Bottoms - Men's
$55.89
Save 30%
compared to $79.95
138 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends Dec 8
REI Co-opMerino 185 Base Layer Bottoms - Women's
$55.89
Save 30%
compared to $79.95
107 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Sale Ends Dec 8
REI Co-opMerino 185 Long-Sleeve Base Layer Top - Women's
$55.89
Save 30%
compared to $79.95
212 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Men's
$90.00
75 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends Dec 8
Top Rated
REI Co-opMerino Midweight Base Layer Bottoms - Kids'
$34.89
Save 30%
compared to $49.95
16 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Dec 8
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$34.89
Save 30%
compared to $49.95
28 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Dec 8
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.69
Save 25%
compared to $105.00
172 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends Dec 8
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Men's
$62.89
Save 30%
compared to $89.95
114 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends Dec 8
SmartwoolClassic All-Season Merino Base Layer Long-Sleeve Shirt - Women's
$39.73
Save 55%
compared to $90.00
77 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends Dec 8
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$78.69
Save 25%
compared to $105.00
157 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Sale Ends Dec 8
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$78.69
Save 25%
compared to $105.00
65 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolClassic All-Season Merino Long-Sleeve Base Layer Top - Women's
$90.00
131 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Sale Ends Dec 8
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$93.69
Save 25%
compared to $125.00
65 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Sale Ends Dec 8
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$93.69
Save 25%
compared to $125.00
65 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$99.95
10 reviews with an average rating of 4.6 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
23 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Sale Ends Dec 8
Top Rated
REI Co-opMerino 185 Long-Sleeve Half-Zip Base Layer Top - Women's
$62.89
Save 30%
compared to $89.95
104 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95
31 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big, Tall
Sale Ends Dec 8
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$78.69
Save 25%
compared to $105.00
79 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Women's
$99.95
32 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
37 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$96.73
Save 25%
compared to $130.00
122 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends Dec 8
Top Rated
Icebreaker260 Tech High-Rise Base Layer Leggings - Women's
$93.69
Save 25%
compared to $125.00
20 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular

1–30 of 272 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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