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Thermals

(210 products)

Products (210)

Sort: Best Match

Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Women's
$115.00
1190 reviews with an average rating of 4.7 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Men's
$115.00
632 reviews with an average rating of 4.7 out of 5 stars
SmartwoolClassic Thermal Merino Base Layer Bottoms - Women's
$115.00
752 reviews with an average rating of 4.4 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Men's
$115.00
1501 reviews with an average rating of 4.7 out of 5 stars
Top Rated
IcebreakerMerino 200 Oasis Thermal Leggings - Women's
$105.00
81 reviews with an average rating of 4.5 out of 5 stars
REI Co-opMidweight Long-Sleeve Base Layer Top - Women's
$54.95
302 reviews with an average rating of 4.2 out of 5 stars
Top Rated
Icebreaker260 Merino Tech Thermal Leggings with Fly - Men's
$125.00
67 reviews with an average rating of 4.7 out of 5 stars
REI Co-opLightweight Long-Sleeve Crew Base Layer Top - Men's
$27.93 - $44.95
27 reviews with an average rating of 4.3 out of 5 stars
REI Co-opLightweight Base Layer Bottoms - Men's
$44.95
21 reviews with an average rating of 4.4 out of 5 stars
SmartwoolThermal Merino Reversible Neck Gaiter
$32.00
59 reviews with an average rating of 4.3 out of 5 stars
Top Rated
SmartwoolThermal Merino Reversible Cuffed Beanie
$35.00
564 reviews with an average rating of 4.6 out of 5 stars
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$65.00
0 reviews
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Women's
$105.00
170 reviews with an average rating of 4.7 out of 5 stars
REI Co-opSwiftland Thermal Running Crew Pullover - Women's
$55.93
Save 30%
compared to $79.95
21 reviews with an average rating of 4.2 out of 5 stars
Top Rated
REI Co-opSwiftland Thermal Running Crew Pullover - Men's
$55.93 - $79.95
14 reviews with an average rating of 4.6 out of 5 stars
Top Rated
REI Co-opHeavyweight Merino Base Layer Bottoms - Men's
$99.95
14 reviews with an average rating of 4.7 out of 5 stars
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Women's
$96.73
Save 25%
compared to $130.00
125 reviews with an average rating of 4.2 out of 5 stars
REI OUTLET
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Crewe Thermal Top - Men's
$105.00
198 reviews with an average rating of 4.7 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Women's
$120.00
50 reviews with an average rating of 4.8 out of 5 stars
SmartwoolIntraknit Thermal Merino Crew Base Layer Top - Men's
$92.73
Save 28%
compared to $130.00
10 reviews with an average rating of 4.0 out of 5 stars
REI OUTLET
SmartwoolThermal Merino Gloves
$40.00
264 reviews with an average rating of 3.7 out of 5 stars
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$65.00
6 reviews with an average rating of 3.7 out of 5 stars
REI Co-opSwiftland Thermal Running Tights - Women's
$58.93
Save 30%
compared to $84.95
31 reviews with an average rating of 3.9 out of 5 stars
Top Rated
REI Co-opSwiftland Thermal Running Half-Zip Pullover - Women's
$44.83 - $89.95
38 reviews with an average rating of 4.5 out of 5 stars
Arc'teryxTaema Thermal Hoody - Women's
$69.93 - $79.93
Save 20% - 30%
compared to $100.00
1 reviews with an average rating of 5.0 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino 3/4 Base Layer Bottoms - Men's
$105.00
85 reviews with an average rating of 4.6 out of 5 stars
SmartwoolIntraknit Thermal Merino Base Layer Bottoms - Women's
$130.00
28 reviews with an average rating of 4.3 out of 5 stars
Top Rated
REI Co-opHeavyweight Merino Long-Sleeve Base Layer Crew Top - Men's
$99.95
36 reviews with an average rating of 4.5 out of 5 stars
Top Rated
IcebreakerMerino 260 Tech Long-Sleeve Crewe Thermal Top - Men's
$125.00
68 reviews with an average rating of 4.7 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Quarter-Zip Base Layer Top - Men's
$120.00
44 reviews with an average rating of 4.6 out of 5 stars

1–30 of 210 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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