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Kids Thermal Underwear

(22 products)

Products (22)

Sort: Best Match

SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$44.73 - $46.73
Save 28% - 31%
compared to $65.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
5 reviews with an average rating of 3.6 out of 5 stars
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$46.73
Save 28%
compared to $65.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
52 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
Top Rated
REI Co-opMidweight Base Layer Bottoms - Kids'
$23.93 - $34.95
8 reviews with an average rating of 4.6 out of 5 stars
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$23.93 - $34.95
5 reviews with an average rating of 5.0 out of 5 stars
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$35.93 - $65.00
80 reviews with an average rating of 4.8 out of 5 stars
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Kids'
$51.73
Save 26%
compared to $70.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
0 reviews
REI OUTLET
Top Rated
IcebreakerMerino 260 Tech Thermal Base Layer Leggings - Kids'
$49.73
Save 28%
compared to $70.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
7 reviews with an average rating of 5.0 out of 5 stars
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
IcebreakerMerino 260 Tech Long-Sleeve Half-Zip Thermal Base Layer Top - Kids'
$52.73
Save 29%
compared to $75.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
4 reviews with an average rating of 4.5 out of 5 stars
REI OUTLET
New arrival
Deux par DeuxThermal Underwear Base Layer Set - Kids'
$72.00
0 reviews
SmartwoolClassic Thermal Merino Base Layer Hoodie - Kids'
$51.73
Save 31%
compared to $75.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
3 reviews with an average rating of 4.7 out of 5 stars
REI OUTLET
New arrival
Deux par DeuxThermal Underwear Base Layer Set - Toddlers'
$72.00
0 reviews
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$65.00
0 reviews
Helly HansenMerino Wool Base Layer Set - Kids'
$75.73
Save 36%
compared to $120.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
0 reviews
REI OUTLET
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
Top Rated
Icebreaker260 Tech Thermal Base Layer Leggings - Kids'
$70.00
7 reviews with an average rating of 5.0 out of 5 stars
Top Rated
IcebreakerMerino 200 Oasis Long-Sleeve Base Layer Crew Top - Kids'
$41.93
Save 30%
compared to $60.00
8 reviews with an average rating of 4.5 out of 5 stars
Helly HansenGraphic Lifa Merino Base Layer Set - Kids'
$74.73
Save 32%
compared to $110.00
Members use code LABORDAY2025 for an extra 20% off at REI Outlet
1 reviews with an average rating of 1.0 out of 5 stars
REI OUTLET
Top Rated
ColumbiaMidweight Tights 2 - Kids'
$14.83
Save 50%
compared to $30.00
59 reviews with an average rating of 4.8 out of 5 stars
Top Rated
ColumbiaOmni-Heat Midweight Crew Base Layer Top - Kids'
$14.83
Save 50%
compared to $30.00
71 reviews with an average rating of 4.8 out of 5 stars
New arrival
BurtonFleece Base Layer Set - Toddlers'
$64.95
0 reviews
New arrival
BurtonFleece Base Layer Set - Toddlers'
$64.95
0 reviews

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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