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Icebreaker Underwear

(61 products)

Products (61)

Sort: Best Match

Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$78.73
Save 25%
compared to $105.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
129 reviews with an average rating of 4.7 out of 5 stars
Size Type:
Regular, Plus
REI OUTLET
IcebreakerMerino 200 Oasis Thermal Base Layer Leggings - Women's
$78.73
Save 25%
compared to $105.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
68 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$105.00
129 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$78.73
Save 25%
compared to $105.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
64 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Big, Regular
REI OUTLET
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 OUT4JUL25 for $20 off $100+ at REI Outlet
18 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
132 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 Half-Zip Thermal Base Layer Top - Women's
$99.73
Save 26%
compared to $135.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI OUTLET
Icebreaker200 Sonebula Leggings - Men's
$89.73
Save 25%
compared to $120.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
4 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'
$41.93 - $60.00
8 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Kids'
$49.73
Save 28%
compared to $70.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
7 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Top Rated
Icebreaker260 Tech Long-Sleeve Crewe Base Layer Top - Women's
$125.00
36 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
IcebreakerMerino 260 Vertex Long-Sleeve Crewe Natural Shades Base Layer Top - Women's
$104.73
Save 25%
compared to $140.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Kids'
$52.73
Save 29%
compared to $75.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
4 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Base Layer Leggings with Fly - Men's
$105.00
53 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
58 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Icebreaker125 ZoneKnit Long-Sleeve Crewe Base Layer Thermal Top - Women's
$93.73
Save 25%
compared to $125.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
4 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
Icebreaker260 Tech High-Rise Base Layer Leggings - Women's
$125.00
14 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
52 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
Top Rated
IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Women's
$93.73
Save 25%
compared to $125.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
21 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Plus
REI OUTLET
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Women's
$115.00
18 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
IcebreakerMerino 260 Tech Long Sleeve Crewe Base Layer Top - Men's
$119.73
Save 27%
compared to $165.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
5 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Men's
$99.73
Save 26%
compared to $135.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
35 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular, Big
REI OUTLET
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
68 reviews with an average rating of 4.4 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Plus
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Base Layer Top - Women's
$135.00
25 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Icebreaker200 Oasis Crewe Base Layer Top - Men's
$95.00
30 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
IcebreakerMerino 150 Tech Lite III Relaxed T-Shirt - Women's
$80.00
78 reviews with an average rating of 4.5 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
Icebreaker200 Oasis Long-Sleeve Half-Zip Base Layer Top - Men's
$115.00
17 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular, Big
Icebreaker125 ZoneKnit Crewe Base Layer Shirt - Women's
$84.73
Save 26%
compared to $115.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Icebreaker125 ZoneKnit Merino Thermal Leggings - Men's
$93.73
Save 25%
compared to $125.00
Members use code OUT4JUL25 for $20 off $100+ at REI Outlet
0 reviews
Underwear Weight:
Ultralightweight
Size Type:
Regular, Big
REI OUTLET
IcebreakerMerino 200 Oasis Base Layer Leggings - Kids'
$41.93
Save 30%
compared to $60.00
6 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular

1–30 of 61 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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