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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.

11,836 items
Lands' End Size 10
Lands' End Size 10
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View Product: Lands' End Size 10

Lands' End

Size 10
$6.99 $71
Under Armour Size Small youth
Under Armour Size Small youth
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View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$7.99 $26

$6.39 20% off with

Jumping Beans Size 6
Jumping Beans Size 6
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View Product: Jumping Beans Size 6

Jumping Beans

Size 6
$3.99 $16
Carter's Size Small youth
Carter's Size Small youth
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View Product: Carter's Size Small youth

Carter's

Size Small youth
$4.99 $41
New Balance Size 4
New Balance Size 4
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View Product: New Balance Size 4

New Balance

Size 4
$3.99 $38
Polo by Ralph Lauren Size 3
Polo by Ralph Lauren Size 3
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View Product: Polo by Ralph Lauren Size 3

Polo by Ralph Lauren

Size 3
$12.99 $43

$7.79 40% off with

Athletech Size 8
Athletech Size 8
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View Product: Athletech Size 8

Athletech

Size 8
$3.99 $15
Athletech Size 8
Athletech Size 8
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View Product: Athletech Size 8

Athletech

Size 8
$3.99 $15
Miniclasix Size 12-18 mo
Miniclasix Size 12-18 mo
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View Product: Miniclasix Size 12-18 mo

Miniclasix

Size 12-18 mo
$5.99 $82
Nike Size Medium youth
Nike Size Medium youth
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View Product: Nike Size Medium youth

Nike

Size Medium youth
$3.99 $38
Under Armour Size X-Large youth
Under Armour Size X-Large youth
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View Product: Under Armour Size X-Large youth

Under Armour

Size X-Large youth
$8.99 $38

$6.29 30% off with

Assorted Brands Size Small youth
Assorted Brands Size Small youth
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View Product: Assorted Brands Size Small youth

Assorted Brands

Size Small youth
$3.99 $20
Danskin Now Size Small kids
Danskin Now Size Small kids
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View Product: Danskin Now Size Small kids

Danskin Now

Size Small kids
$3.99 $13
NHL Size 18 mo
NHL Size 18 mo
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View Product: NHL Size 18 mo

NHL

Size 18 mo
$3.99 $27
Carter's Size 18 mo
Carter's Size 18 mo
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View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$3.99 $20
Gymboree Size 12-18 mo
Gymboree Size 12-18 mo
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View Product: Gymboree Size 12-18 mo

Gymboree

Size 12-18 mo
$3.99 $35
Circo Size 3T
Circo Size 3T
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View Product: Circo Size 3T

Circo

Size 3T
$3.99 $17
Member's Mark Size 2T
Member's Mark Size 2T
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View Product: Member's Mark Size 2T

Member's Mark

Size 2T
$3.99 $10
Greendog Size 18 mo
Greendog Size 18 mo
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View Product: Greendog Size 18 mo

Greendog

Size 18 mo
$3.99 $20
Carter's Size 6 mo
Carter's Size 6 mo
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View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$3.99 $20
C9 By Champion Size 7
C9 By Champion Size 7
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View Product: C9 By Champion Size 7

C9 By Champion

Size 7
$3.99 $15
Baby Gap Size 12-18 mo
Baby Gap Size 12-18 mo
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View Product: Baby Gap Size 12-18 mo

Baby Gap

Size 12-18 mo
$4.99 $30
Gap Fit Size X-Small youth
Gap Fit Size X-Small youth
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View Product: Gap Fit Size X-Small youth

Gap Fit

Size X-Small youth
$6.99 $38
Nike Size 18 mo
Nike Size 18 mo
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View Product: Nike Size 18 mo

Nike

Size 18 mo
$8.99 $25

$6.29 30% off with

Jordan Size 10
Jordan Size 10
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View Product: Jordan Size 10

Jordan

Size 10
$11.99 $61

$7.19 40% off with

Old Navy Size 12-18 mo
Old Navy Size 12-18 mo
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View Product: Old Navy Size 12-18 mo

Old Navy

Size 12-18 mo
$3.99 $20
NFL Size Large youth
NFL Size Large youth
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View Product: NFL Size Large youth

NFL

Size Large youth
$11.99 $61

$7.19 40% off with

Baby Gap Size 0-3 mo
Baby Gap Size 0-3 mo
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View Product: Baby Gap Size 0-3 mo

Baby Gap

Size 0-3 mo
$3.99 $18
Gymboree Size Newborn
Gymboree Size Newborn
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View Product: Gymboree Size Newborn

Gymboree

Size Newborn
$3.99 $18
Unbranded Size X-Large youth
Unbranded Size X-Large youth
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View Product: Unbranded Size X-Large youth

Unbranded

Size X-Large youth
$4.99 $31
Pro Edge by Knights Apparel Size 2T
Pro Edge by Knights Apparel Size 2T
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View Product: Pro Edge by Knights Apparel Size 2T
Cat & Jack Size Newborn
Cat & Jack Size Newborn
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View Product: Cat & Jack Size Newborn

Cat & Jack

Size Newborn
$3.99 $10
Jumping Beans Size 3T
Jumping Beans Size 3T
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View Product: Jumping Beans Size 3T

Jumping Beans

Size 3T
$3.99 $13
Jumping Beans Size 4
Jumping Beans Size 4
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View Product: Jumping Beans Size 4

Jumping Beans

Size 4
$3.99 $17
Carter's Size 9 mo
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$3.99 $20
Carter's Size 6 mo
Carter's Size 6 mo
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View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$3.99 $20
Carter's Size 3 mo
Carter's Size 3 mo
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View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$3.99 $20
Old Navy Size 18-24 mo
Old Navy Size 18-24 mo
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View Product: Old Navy Size 18-24 mo

Old Navy

Size 18-24 mo
$3.99 $20
NFL Size 18
NFL Size 18
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View Product: NFL Size 18

NFL

Size 18
$11.99 $61

$7.19 40% off with

Jordan Size 10
Jordan Size 10
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View Product: Jordan Size 10

Jordan

Size 10
$8.99 $61

$6.29 30% off with

Hard Edge Size 7
Hard Edge Size 7
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View Product: Hard Edge Size 7

Hard Edge

Size 7
$8.99 $41

$6.29 30% off with

Xersion Size Large kids
Xersion Size Large kids
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View Product: Xersion Size Large kids

Xersion

Size Large kids
$4.99 $23
Old Navy Size 6-12 mo
Old Navy Size 6-12 mo
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View Product: Old Navy Size 6-12 mo

Old Navy

Size 6-12 mo
$3.99 $17
Carter's Size 12 mo
Carter's Size 12 mo
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View Product: Carter's Size 12 mo

Carter's

Size 12 mo
$3.99 $20
Carter's Size 6 mo
Carter's Size 6 mo
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View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$3.99 $27
Carter's Size 6 mo
Carter's Size 6 mo
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View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$3.99 $20
Carter's Size 6 mo
Carter's Size 6 mo
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View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$3.99 $20
Nike Size Large youth
Nike Size Large youth
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View Product: Nike Size Large youth

Nike

Size Large youth
$15.99 $89

$7.99 50% off with

Under Armour Size X-Large youth
Under Armour Size X-Large youth
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View Product: Under Armour Size X-Large youth

Under Armour

Size X-Large youth
$4.99 $38
Old Navy Size 6-12 mo
Old Navy Size 6-12 mo
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View Product: Old Navy Size 6-12 mo

Old Navy

Size 6-12 mo
$4.99 $17
Nickelodeon Size 3-6 mo
Nickelodeon Size 3-6 mo
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View Product: Nickelodeon Size 3-6 mo

Nickelodeon

Size 3-6 mo
$3.99 $15
Old Navy Size 12-18 mo
Old Navy Size 12-18 mo
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View Product: Old Navy Size 12-18 mo

Old Navy

Size 12-18 mo
$3.99 $17
Carter's Size 18 mo
Carter's Size 18 mo
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View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$3.99 $20
Carter's Size 6 mo
Carter's Size 6 mo
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View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$3.99 $20
Colosseum Athletics Size 0-3 mo
Colosseum Athletics Size 0-3 mo
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View Product: Colosseum Athletics Size 0-3 mo

Colosseum Athletics

Size 0-3 mo
$3.99 $20
Carter's Size 24 mo
Carter's Size 24 mo
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View Product: Carter's Size 24 mo

Carter's

Size 24 mo
$3.99 $20
Carter's Size 9 mo
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$3.99 $20
Carter's Size 18 mo
Carter's Size 18 mo
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View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$3.99 $20
Air Jordan Size Small youth
Air Jordan Size Small youth
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View Product: Air Jordan Size Small youth

Air Jordan

Size Small youth
$14.99 $61

$7.49 50% off with

Arena Size 6
Arena Size 6
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View Product: Arena Size 6

Arena

Size 6
$11.99 $61

$5.99 50% off with

Tailored Sportsman Size X-Large youth
Tailored Sportsman Size X-Large youth
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View Product: Tailored Sportsman Size X-Large youth

Tailored Sportsman

Size X-Large youth
$8.99 $107

$6.29 30% off with

Assorted Brands Size X-Large youth
Assorted Brands Size X-Large youth
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View Product: Assorted Brands Size X-Large youth

Assorted Brands

Size X-Large youth
$4.99 $31
Port and Company Size Medium youth
Port and Company Size Medium youth
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View Product: Port and Company Size Medium youth

Port and Company

Size Medium youth
$4.99 $23
OshKosh B'gosh Size 5
OshKosh B'gosh Size 5
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View Product: OshKosh B'gosh Size 5

OshKosh B'gosh

Size 5
$3.99 $34
Old Navy Size 12-18 mo
Old Navy Size 12-18 mo
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View Product: Old Navy Size 12-18 mo

Old Navy

Size 12-18 mo
$3.99 $20
Reebok Size 24 mo
Reebok Size 24 mo
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View Product: Reebok Size 24 mo

Reebok

Size 24 mo
$3.99 $34
OshKosh B'gosh Size 12 mo
OshKosh B'gosh Size 12 mo
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View Product: OshKosh B'gosh Size 12 mo

OshKosh B'gosh

Size 12 mo
$4.99 $27
Carter's Size 3T
Carter's Size 3T
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View Product: Carter's Size 3T

Carter's

Size 3T
$3.99 $28
Coco Blanc Size 12-18 mo
Coco Blanc Size 12-18 mo
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View Product: Coco Blanc Size 12-18 mo

Coco Blanc

Size 12-18 mo
$9.99 $62

$5.99 40% off with

Nike Size 3-6 mo
Nike Size 3-6 mo
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View Product: Nike Size 3-6 mo

Nike

Size 3-6 mo
$9.99 $41

$5.99 40% off with

Carter's Size 12 mo
Carter's Size 12 mo
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View Product: Carter's Size 12 mo

Carter's

Size 12 mo
$3.99 $20
Carter's Size 24 mo
Carter's Size 24 mo
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View Product: Carter's Size 24 mo

Carter's

Size 24 mo
$3.99 $20
Afton Street Size 18 mo
Afton Street Size 18 mo
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View Product: Afton Street Size 18 mo

Afton Street

Size 18 mo
$3.99 $14
Carter's Size 3 mo
Carter's Size 3 mo
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View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$3.99 $20
Old Navy Size 12-18 mo
Old Navy Size 12-18 mo
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View Product: Old Navy Size 12-18 mo

Old Navy

Size 12-18 mo
$3.99 $17
Carter's Size 9 mo
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$3.99 $20
Carter's Size 18 mo
Carter's Size 18 mo
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View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$3.99 $20
Carter's Size 9 mo
Carter's Size 9 mo
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View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$3.99 $20
Carter's Size 3 mo
Carter's Size 3 mo
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View Product: Carter's Size 3 mo

Carter's

Size 3 mo
$3.99 $20
Carter's Size 12 mo
Carter's Size 12 mo
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View Product: Carter's Size 12 mo

Carter's

Size 12 mo
$3.99 $20
Baby Gap Size 6-12 mo
Baby Gap Size 6-12 mo
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