Boys' Activewear

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Cater to your boys' busy lifestyles with affordable activewear from thredUP. Enjoy steep savings with prices up to 90% off estimated retail when you shop our extensive collection of hoodies, tops, shorts, and pants.

35,777 items
Carter's Size Newborn
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View Product: Carter's Size Newborn

Carter's

Size Newborn
$10.99 $20

$5.49 50% off with

Souris Mini Size 3
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View Product: Souris Mini Size 3

Souris Mini

Size 3
$10.99 $26

$5.49 50% off with

Xersion Size Medium youth
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Xersion

Size Medium youth
$10.99 $23

$5.49 50% off with

Carter's Size 9 mo
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Carter's

Size 9 mo
$10.99 $20

$5.49 50% off with

Carter's Size 9 mo
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Carter's

Size 9 mo
$10.99 $20

$5.49 50% off with

Baby Gap Size 12-18 mo
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View Product: Baby Gap Size 12-18 mo

Baby Gap

Size 12-18 mo
$10.99 $15

$5.49 50% off with

Heat Gear by Under Armour Size Medium youth
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View Product: Heat Gear by Under Armour Size Medium youth

Heat Gear by Under Armour

Size Medium youth
$10.99 $31

$5.49 50% off with

Carter's Size 4T
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View Product: Carter's Size 4T

Carter's

Size 4T
$10.99 $26

$5.49 50% off with

Baby Gap Size 4

View Product: Baby Gap Size 4

Baby Gap

Size 4
$10.99 $19

$7.69 30% off with

Adidas Size 10

View Product: Adidas Size 10

Adidas

Size 10
$20.99 $51

$12.59 40% off with

Under Armour Size X-Large youth

View Product: Under Armour Size X-Large youth

Under Armour

Size X-Large youth
$19.99 $41

$11.99 40% off with

Marvel Size 3

View Product: Marvel Size 3

Marvel

Size 3
$17.99 $36

$10.79 40% off with

Under Armour Size 7

View Product: Under Armour Size 7

Under Armour

Size 7
$21.99 $41

$13.19 40% off with

D.A.C. Athletic Club Size 14
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View Product: D.A.C. Athletic Club Size 14

D.A.C. Athletic Club

Size 14
$9.99 $20
Xersion Size 10
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View Product: Xersion Size 10

Xersion

Size 10
$9.99 $15
Assorted Brands Size Large kids
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View Product: Assorted Brands Size Large kids

Assorted Brands

Size Large kids
$10.99 $31
Cat & Jack Size 16
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View Product: Cat & Jack Size 16

Cat & Jack

Size 16
$11.99 $10
Adidas Size 3T
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View Product: Adidas Size 3T

Adidas

Size 3T
$7.99 $21
Assorted Brands Size 12 mo
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View Product: Assorted Brands Size 12 mo

Assorted Brands

Size 12 mo
$9.99 $20
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$9.99 $20
Assorted Brands Size Large youth
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View Product: Assorted Brands Size Large youth

Assorted Brands

Size Large youth
$9.99 $20
Assorted Brands Size 10
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View Product: Assorted Brands Size 10

Assorted Brands

Size 10
$9.99 $31
Unbranded Size 12 mo
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View Product: Unbranded Size 12 mo

Unbranded

Size 12 mo
$10.99 $20
Rag Wear Size X-Small youth
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View Product: Rag Wear Size X-Small youth

Rag Wear

Size X-Small youth
$9.99 $31
Gap Fit Size 8
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View Product: Gap Fit Size 8

Gap Fit

Size 8
$9.99 $38
Adidas Size Small youth
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View Product: Adidas Size Small youth

Adidas

Size Small youth
$10.99 $38
Adidas Size 24 mo
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View Product: Adidas Size 24 mo

Adidas

Size 24 mo
$10.99 $17
Baby Gap Size 6-12 mo
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View Product: Baby Gap Size 6-12 mo

Baby Gap

Size 6-12 mo
$7.99 $30
Baby Gap Size 0-3 mo
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View Product: Baby Gap Size 0-3 mo

Baby Gap

Size 0-3 mo
$7.99 $18
Baby Gap Size 3
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View Product: Baby Gap Size 3

Baby Gap

Size 3
$9.99 $18
KA Knights Apparel Size Large youth
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View Product: KA Knights Apparel Size Large youth

KA Knights Apparel

Size Large youth
$7.99 $10
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$9.99 $20
Assorted Brands Size Medium youth
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View Product: Assorted Brands Size Medium youth

Assorted Brands

Size Medium youth
$9.99 $31
OshKosh B'gosh Size 4
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View Product: OshKosh B'gosh Size 4

OshKosh B'gosh

Size 4
$11.99 $34
Yazbek Size Medium youth
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View Product: Yazbek Size Medium youth

Yazbek

Size Medium youth
$9.99 $20
all in motion Size 6
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View Product: all in motion Size 6

all in motion

Size 6
$9.99 $15
Carter's Size 3 mo
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View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$7.99 $20
Baby Gap Size 0-3 mo
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View Product: Baby Gap Size 0-3 mo

Baby Gap

Size 0-3 mo
$9.99 $18
PLACE Sport Size Small youth
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View Product: PLACE Sport Size Small youth

PLACE Sport

Size Small youth
$9.99 $13
Old Navy Size 10
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View Product: Old Navy Size 10

Old Navy

Size 10
$11.99 $20
Old Navy Size 6
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View Product: Old Navy Size 6

Old Navy

Size 6
$10.99 $17
Zara Size 18-24 mo
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View Product: Zara Size 18-24 mo

Zara

Size 18-24 mo
$7.99 $26
Hummel Size 140 cm
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View Product: Hummel Size 140 cm

Hummel

Size 140 cm
$9.99 $31
Starter Size 8
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View Product: Starter Size 8

Starter

Size 8
$9.99 $10
Easton Size X-Small youth

View Product: Easton Size X-Small youth

Easton

Size X-Small youth
$7.99 $16
Gumballs Size 3T
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View Product: Gumballs Size 3T

Gumballs

Size 3T
$9.99 $26
Reebok Size 10
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View Product: Reebok Size 10

Reebok

Size 10
$10.99 $38
Star Size 6
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View Product: Star Size 6

Star

Size 6
$9.99 $15
Child of Mine by Carter's Size 18 mo
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View Product: Child of Mine by Carter's Size 18 mo

Child of Mine by Carter's

Size 18 mo
$9.99 $10
United Colors Of Benetton Size 9-12 mo
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View Product: United Colors Of Benetton Size 9-12 mo

United Colors Of Benetton

Size 9-12 mo
$9.99 $27
Umbro Size 4
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View Product: Umbro Size 4

Umbro

Size 4
$7.99 $13
Russell Athletic Size 10
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View Product: Russell Athletic Size 10

Russell Athletic

Size 10
$9.99 $15
Baby Gap Size 6-12 mo
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View Product: Baby Gap Size 6-12 mo

Baby Gap

Size 6-12 mo
$9.99 $18
Heat Gear by Under Armour Size Large youth
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View Product: Heat Gear by Under Armour Size Large youth

Heat Gear by Under Armour

Size Large youth
$9.99 $31
Carter's Size 3 mo
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View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$7.99 $27
Champion Size 10
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View Product: Champion Size 10

Champion

Size 10
$7.99 $15
Under Armour Size 24 mo
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View Product: Under Armour Size 24 mo

Under Armour

Size 24 mo
$9.99 $17
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$9.99 $27
Baby Gap Size 0-3 mo
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View Product: Baby Gap Size 0-3 mo

Baby Gap

Size 0-3 mo
$9.99 $18
Russell Athletic Size 4
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View Product: Russell Athletic Size 4

Russell Athletic

Size 4
$9.99 $13
EvoShield Size Medium youth
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View Product: EvoShield Size Medium youth

EvoShield

Size Medium youth
$9.99 $46
Gap Kids Size 5
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View Product: Gap Kids Size 5

Gap Kids

Size 5
$7.99 $25
Active by Old Navy Size 8
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View Product: Active by Old Navy Size 8

Active by Old Navy

Size 8
$10.99 $19
Carter's Size 18 mo
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View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$9.99 $20
Assorted Brands Size 18 mo
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View Product: Assorted Brands Size 18 mo

Assorted Brands

Size 18 mo
$9.99 $20
Puma Size 2T
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View Product: Puma Size 2T

Puma

Size 2T
$9.99 $20
Gap Kids Size 12-18 mo
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View Product: Gap Kids Size 12-18 mo

Gap Kids

Size 12-18 mo
$9.99 $30
Jumping Beans Size 6
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View Product: Jumping Beans Size 6

Jumping Beans

Size 6
$9.99 $16
WES AND WILLY Size 2T
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View Product: WES AND WILLY Size 2T

WES AND WILLY

Size 2T
$9.99 $17
Carter's Size 3 mo
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View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$9.99 $20
C9 By Champion Size 6
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View Product: C9 By Champion Size 6

C9 By Champion

Size 6
$9.99 $10
Baby Gap Size 2T
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View Product: Baby Gap Size 2T

Baby Gap

Size 2T
$7.99 $18
Assorted Brands Size Large youth
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View Product: Assorted Brands Size Large youth

Assorted Brands

Size Large youth
$11.99 $31
OshKosh B'gosh Size 18 mo
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View Product: OshKosh B'gosh Size 18 mo

OshKosh B'gosh

Size 18 mo
$11.99 $22
Jumping Beans Size 5
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View Product: Jumping Beans Size 5

Jumping Beans

Size 5
$7.99 $16
Carter's Size 4
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View Product: Carter's Size 4

Carter's

Size 4
$9.99 $26
The Children's Place Size 5
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View Product: The Children's Place Size 5

The Children's Place

Size 5
$10.99 $30
Nickelodeon Size 4T
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View Product: Nickelodeon Size 4T

Nickelodeon

Size 4T
$11.99 $26
Puma Size 4
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View Product: Puma Size 4

Puma

Size 4
$9.99 $17
Carter's Size 9
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View Product: Carter's Size 9

Carter's

Size 9
$11.99 $31
Spotted Zebra Size 6
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View Product: Spotted Zebra Size 6

Spotted Zebra

Size 6
$9.99 $20
Gap Size 2
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View Product: Gap Size 2

Gap

Size 2
$9.99 $15
Athletic Works Size 14 Husky
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View Product: Athletic Works Size 14 Husky

Athletic Works

Size 14 Husky
$11.99 $10
The Children's Place Size 3T
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View Product: The Children's Place Size 3T

The Children's Place

Size 3T
$9.99 $18
Sport-Tek Size Large youth
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View Product: Sport-Tek Size Large youth

Sport-Tek

Size Large youth
$7.99 $23
Carter's Size 9 mo
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View Product: Carter's Size 9 mo