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Merino Wool Underwear

(283 products)

Products (283)

Sort: Best Match

Sale Ends Today
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$97.49
Save 25%
compared to $130.00
190 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
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
64 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Sale Ends Dec 8
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$93.69
Save 25%
compared to $125.00
41 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$81.73
Save 28%
compared to $115.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
384 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Sale Ends Today
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$97.49
Save 25%
compared to $130.00
191 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Half-Zip Thermal Base Layer Top - Women's
$84.73
Save 26%
compared to $115.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
34 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.73
Save 25%
compared to $105.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
68 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$65.00
5 reviews with an average rating of 3.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
9 reviews with an average rating of 4.1 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$46.73
Save 28%
compared to $65.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
52 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends Dec 8
IcebreakerMerino 200 Oasis High-Rise Base Layer Leggings - Women's
$86.19
Save 25%
compared to $115.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$65.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's
$78.73
Save 25%
compared to $105.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
79 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
Arc'teryxRho Merino Wool Crew Neck Base Layer Top - Men's
$120.00
34 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Top Rated
Black DiamondSolution 150 Merino Base Layer Crew Top - Women's
$99.73
Save 26%
compared to $135.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
21 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Sale Ends Dec 8
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Men's
$101.19
Save 25%
compared to $135.00
39 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends Today
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Men's
$97.49
Save 25%
compared to $130.00
25 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends Today
Top Rated
SmartwoolIntraknit Thermal Merino Base Layer Quarter-Zip Top - Men's
$104.99
Save 25%
compared to $140.00
11 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Sale Ends Today
SmartwoolClassic All-Season Merino Quarter-Zip Base Layer Top - Women's
$71.19
Save 25%
compared to $95.00
1 reviews with an average rating of 5.0 out of 5 stars
Size Type:
Regular
Sale Ends Dec 8
Icebreaker260 Tech Base Layer Leggings - Women's
$93.69
Save 25%
compared to $125.00
27 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
Sale Ends Dec 8
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$86.19
Save 25%
compared to $115.00
31 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
SmartwoolIntraknit Strappy Bra
$46.73 - $48.73
Save 25% - 28%
compared to $65.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
4 reviews with an average rating of 4.0 out of 5 stars
Bra Support:
Low Impact
Support Style:
Encapsulation
Fabric:
69% nylon/17% elastane/14% polyester
REI OUTLET
SmartwoolIntraknit Racerback Bra
$41.73 - $48.73
Save 25% - 35%
compared to $65.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
3 reviews with an average rating of 3.0 out of 5 stars
Bra Support:
Low Impact
Support Style:
Compression
Fabric:
69% nylon/17% elastane/14% polyester
REI OUTLET
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
$92.73
Save 28%
compared to $130.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
28 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Sale Ends Today
SmartwoolClassic All-Season Merino 3/4 Base Layer Bottoms - Men's
$56.19
Save 25%
compared to $75.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Big
Sale Ends Dec 8
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women's
$86.19
Save 25%
compared to $115.00
34 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 200 Sonebula Long-Sleeve Crewe Base Layer Top - Men's
$89.73
Save 25%
compared to $120.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
7 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
5 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Big
REI OUTLET
Sale Ends Today
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
$97.49
Save 25%
compared to $130.00
28 reviews with an average rating of 4.3 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's
$93.73
Save 25%
compared to $125.00
Members use code CYBER2025 to save an extra 25% on this item, thru 12/1
6 reviews with an average rating of 4.2 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET

61–90 of 283 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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