loaded 43 results

Boys' Underwear

(43 products)

Products (43)

Sort: Best Match

Top Rated
REI Co-opMidweight Base Layer Bottoms - Toddlers'
$24.95
8 reviews with an average rating of 4.9 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Crew Top - Toddlers'
$24.95
15 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opMidweight Base Layer Bottoms - Kids'
$34.95
8 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Helly HansenMerino Wool Base Layer Set - Kids'
$75.73
Save 36%
compared to $120.00
0 reviews
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opMidweight Base Layer Crew Top - Kids'
$34.95
6 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Hot ChillysOriginals Solid Base Layer Pants - Kids'
$34.73
Save 26%
compared to $47.50
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Top Rated
REI Co-opMerino Midweight Base Layer Crew Top - Kids'
$49.95
28 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
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
Top Rated
REI Co-opMerino Midweight Base Layer Bottoms - Kids'
$49.95
16 reviews with an average rating of 4.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Bottoms - Kids'
$20.93
Save 30%
compared to $29.95
10 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$46.73
Save 28%
compared to $65.00
52 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$65.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
REI Co-opLightweight Base Layer Crew Top - Kids'
$20.93
Save 30%
compared to $29.95
13 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
Helly HansenGraphic Lifa Merino Base Layer Set - Kids'
$74.73
Save 32%
compared to $110.00
1 reviews with an average rating of 1.0 out of 5 stars
Underwear Weight:
Heavyweight
Size Type:
Regular
REI OUTLET
Top Rated
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$65.00
80 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
SmartwoolClassic Thermal Merino Base Layer Bottoms - Kids'
$65.00
71 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip - Kids'
$51.73
Save 26%
compared to $70.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
BurtonFleece Base Layer Set - Kids'
$69.95
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
SmartwoolClassic Thermal Merino Crew Base Layer Top - Kids'
$44.73
Save 31%
compared to $65.00
5 reviews with an average rating of 3.6 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Base Layer Hoodie - Kids'
$54.73
Save 27%
compared to $75.00
3 reviews with an average rating of 4.7 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
Sale Ends Dec 2
Top Rated
ColumbiaMidweight Tights 2 - Kids'
$22.49
Save 25%
compared to $30.00
61 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Hot ChillysOriginals Solid Base Layer Crew - Kids'
$34.73
Save 26%
compared to $47.50
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
REI OUTLET
SmartwoolClassic Thermal Merino Base Layer Quarter-Zip Top - Kids'
$70.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Sale Ends Dec 2
Top Rated
ColumbiaOmni-Heat Midweight Crew Base Layer Top - Kids'
$22.49
Save 25%
compared to $30.00
73 reviews with an average rating of 4.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Hootie HooTorrent Layering Fleece Base Layer Set - Toddler's
$75.00
2 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Icebreaker200 Oasis Base Layer Leggings - Kids'
$60.00
6 reviews with an average rating of 3.8 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
Top Rated
Icebreaker200 Oasis Crewe Long-Sleeve Base Layer Top - Kids'
$60.00
9 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Midweight
Size Type:
Regular
BurtonFleece Base Layer Set - Toddlers'
$64.95
0 reviews
Underwear Weight:
Heavyweight
Size Type:
Regular
New arrival
The North FaceDotKnit Thermal Base Layer Set - Toddlers'
$70.00
0 reviews
Underwear Weight:
Midweight
Size Type:
Regular
Hot ChillysPeach Skins Crew Base Layer Top- Kids'
$29.73
Save 33%
compared to $45.00
1 reviews with an average rating of 5.0 out of 5 stars
Underwear Weight:
Lightweight
Size Type:
Regular
REI OUTLET

1–30 of 43 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