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.

27,343 items
Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$25.99 $55

$20.79 20% off with

Hollywood The Jean People Size 4

View Product: Hollywood The Jean People Size 4

Hollywood The Jean People

Size 4
$11.99 $18

$8.39 30% off with

Carter's Size 24 mo

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Carter's

Size 24 mo
$11.99 $22

$8.39 30% off with

Hollywood The Jean People Size 4

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Hollywood The Jean People

Size 4
$11.99 $18

$9.59 20% off with

Leather Weather, Fall’s style hero comes in all silhouettes & colors.
Under Armour Size X-Large youth

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Under Armour

Size X-Large youth
$19.99 $41

$13.99 30% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Nike Size 5

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Nike

Size 5
$18.99 $45

$15.19 20% off with

Adidas Size 14

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Adidas

Size 14
$10.99 $27

$8.79 20% off with

Under Armour Size Large youth

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Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Nike Size Small kids

View Product: Nike Size Small kids

Nike

Size Small kids
$18.99 $45

$15.19 20% off with

Vans Size 7

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Vans

Size 7
$23.99 $55

$19.19 20% off with

Old Navy Size 10

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Old Navy

Size 10
$13.99 $21

$11.19 20% off with

Gap Kids Size 4

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Gap Kids

Size 4
$16.99 $43

$13.59 20% off with

Spend $100 and get $10 credit
Next Size 11

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Next

Size 11
$10.99 $25

$8.79 20% off with

Under Armour Size 5

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Under Armour

Size 5
$19.99 $34

$15.99 20% off with

Lola Size 14

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Lola

Size 14
$10.99 $16

$8.79 20% off with

Heat Gear by Under Armour Size 6

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Heat Gear by Under Armour

Size 6
$14.99 $33

$11.99 20% off with

Under Armour Size Large youth

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Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Under Armour Size Medium youth

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Under Armour

Size Medium youth
$14.99 $27

$11.99 20% off with

Under Armour Size Medium youth

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Under Armour

Size Medium youth
$19.99 $41

$15.99 20% off with

Air Jordan Size 12 mo
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View Product: Air Jordan Size 12 mo

Air Jordan

Size 12 mo
$21.99 $58

$17.59 20% off with

Nike Size Large kids

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Nike

Size Large kids
$15.99 $27

$12.79 20% off with

Under Armour Size 5

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Under Armour

Size 5
$13.99 $34

$11.19 20% off with

Nike Size 3T

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Nike

Size 3T
$12.99 $34

$10.39 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Under Armour Size Small youth

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Under Armour

Size Small youth
$21.99 $41

$17.59 20% off with

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

Heat Gear by Under Armour

Size Small youth
$12.99 $33

$10.39 20% off with

Assorted Brands Size Large youth

View Product: Assorted Brands Size Large youth

Assorted Brands

Size Large youth
$13.99 $33

$11.19 20% off with

Under Armour Size Small youth

View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$19.99 $41

$15.99 20% off with

Caselil Size 6 mo

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Caselil

Size 6 mo
$6.99 $15
Baby Gap Size Medium youth

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Baby Gap

Size Medium youth
$7.99 $16
Converse Size 7

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Converse

Size 7
$17.99 $33

$14.39 20% off with

Assorted Brands Size 12

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Assorted Brands

Size 12
$25.99 $65

$20.79 20% off with

Levi's Size 24 mo

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Levi's

Size 24 mo
$12.99 $29

$10.39 20% off with

PLACE Sport Size 3T

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PLACE Sport

Size 3T
$5.99 $11
Kids Headquarters Size 12 mo

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Kids Headquarters

Size 12 mo
$9.99 $11

$7.99 20% off with

Active by Old Navy Size 8

View Product: Active by Old Navy Size 8

Active by Old Navy

Size 8
$12.99 $20

$10.39 20% off with

Under Armour Size 3-6 mo

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Under Armour

Size 3-6 mo
$21.99 $41

$17.59 20% off with

Under Armour Size Small youth

View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$23.99 $41

$19.19 20% off with

Cat & Jack Size 16

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Cat & Jack

Size 16
$6.99 $12
Under Armour Size Small youth
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View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$19.99 $41

$15.99 20% off with

Carter's Size 6 mo

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Carter's

Size 6 mo
$12.99 $22

$10.39 20% off with

OshKosh B'gosh Size 4T

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OshKosh B'gosh

Size 4T
$13.99 $36

$11.19 20% off with

Under Armour Size Medium youth

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Under Armour

Size Medium youth
$20.99 $41

$16.79 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

John Lewis Boy Size 3

View Product: John Lewis Boy Size 3

John Lewis Boy

Size 3
$11.99 $18

$9.59 20% off with

Adidas Size 3T

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Adidas

Size 3T
$15.99 $34

$12.79 20% off with

Abercrombie Size 9

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Abercrombie

Size 9
$15.99 $37

$12.79 20% off with

Splendid Size 3-6 mo

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Splendid

Size 3-6 mo
$13.99 $33

$11.19 20% off with

Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$16.99 $41

$13.59 20% off with

Under Armour Size 6

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Under Armour

Size 6
$20.99 $41

$16.79 20% off with

Under Armour Size X-Small youth

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Under Armour

Size X-Small youth
$24.99 $55

$19.99 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Active by Old Navy Size Medium youth

View Product: Active by Old Navy Size Medium youth

Active by Old Navy

Size Medium youth
$10.99 $14

$8.79 20% off with

Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$14.99 $27

$11.99 20% off with

Air Jordan Size 4T

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Air Jordan

Size 4T
$19.99 $55

$15.99 20% off with

Baby Gap Size 3

View Product: Baby Gap Size 3

Baby Gap

Size 3
$11.99 $19

$9.59 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$21.99 $41

$17.59 20% off with

Nike Size 18 mo

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Nike

Size 18 mo
$13.99 $27

$11.19 20% off with

Active by Old Navy Size 5

View Product: Active by Old Navy Size 5

Active by Old Navy

Size 5
$11.99 $17

$9.59 20% off with

Jumping Beans Size 4
New With Tags BadgeNew With Tags

View Product: Jumping Beans Size 4

Jumping Beans

Size 4
$13.99 $24

$11.19 20% off with

Under Armour Size X-Large youth

View Product: Under Armour Size X-Large youth

Under Armour

Size X-Large youth
$20.99 $41

$16.79 20% off with

Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$20.99 $41

$16.79 20% off with

Pro Edge Size 8

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Pro Edge

Size 8
$14.99 $33

$11.99 20% off with

Carter's Size 6 mo

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Carter's

Size 6 mo
$8.99 $22

$7.19 20% off with

Under Armour Size 6

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Under Armour

Size 6
$21.99 $41

$17.59 20% off with

No Retreat Size 3T

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No Retreat

Size 3T
$12.99 $14

$10.39 20% off with

Spiderman Size 3T

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Spiderman

Size 3T
$13.99 $18

$11.19 20% off with

Heat Gear by Under Armour Size 18-24 mo

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Heat Gear by Under Armour

Size 18-24 mo
$12.99 $22

$10.39 20% off with

Adidas Size Large kids

View Product: Adidas Size Large kids

Adidas

Size Large kids
$13.99 $27

$11.19 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$17.99 $41

$14.39 20% off with

Abercrombie & Fitch Size 7

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Abercrombie & Fitch

Size 7
$16.99 $49

$13.59 20% off with

Heat Gear by Under Armour Size 6

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Heat Gear by Under Armour

Size 6
$15.99 $33

$12.79 20% off with

Nike Size 3-6 mo

View Product: Nike Size 3-6 mo

Nike

Size 3-6 mo
$11.99 $27

$9.59 20% off with

Assorted Brands Size 18
New With Tags BadgeNew With Tags

View Product: Assorted Brands Size 18

Assorted Brands

Size 18
$11.99 $33

$9.59 20% off with

Old Navy Size 3-6 mo

View Product: Old Navy Size 3-6 mo

Old Navy

Size 3-6 mo
$12.99 $21

$10.39 20% off with

Hurley Size 7

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Hurley

Size 7
$14.99 $49

$11.99 20% off with

Carter's Size 6 mo

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Carter's

Size 6 mo
$8.99 $22
Adidas Size 4

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Adidas

Size 4
$11.99 $34

$9.59 20% off with

Old Navy Size 18-24 mo

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Old Navy

Size 18-24 mo
$9.99 $21

$7.99 20% off with

Baby Gap Size 2

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Baby Gap

Size 2
$12.99 $32

$10.39 20% off with

Active by Old Navy Size 8

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Active by Old Navy

Size 8
$9.99 $14

$7.99 20% off with

Under Armour Size Medium kids

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Under Armour

Size Medium kids
$20.99 $41

$16.79 20% off with

Adidas Size 10

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Adidas

Size 10
$21.99 $55

$17.59 20% off with

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

Heat Gear by Under Armour

Size Small youth
$12.99 $33

$10.39 20% off with

Under Armour Size X-Small  kids

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Under Armour

Size X-Small kids
$21.99 $45

$17.59 20% off with

Carter's Size 18 mo

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Carter's

Size 18 mo
$11.99 $22

$9.59 20% off with

Puma Size 8

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Puma

Size 8
$16.99 $33

$13.59 20% off with

Carter's Size 9 mo

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Carter's

Size 9 mo
$12.99 $22

$10.39 20% off with

Gap Kids Size Medium kids

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Gap Kids

Size Medium kids
$16.99 $43

$13.59 20% off with

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

Heat Gear by Under Armour

Size Small youth
$12.99 $33

$10.39 20% off with

Splendid Size 3T

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Splendid

Size 3T
$12.99 $41

$10.39 20% off with

Under Armour Size Large youth

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Under Armour

Size Large youth
$20.99 $41

$16.79 20% off with

Hanna Andersson Size 70 cm

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Hanna Andersson

Size 70 cm
$22.99 $48

$18.39 20% off with

Gap Fit Size X-Large youth

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Gap Fit

Size X-Large youth
$14.99 $27

$11.99 20% off with

Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$15.99 $27

$12.79 20% off with

Columbia Size 4

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Columbia

Size 4
$10.99 $27

$8.79 20% off with

Under Armour Size Medium youth

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Under Armour

Size Medium youth
$19.99 $41

$15.99 20% off with

Adidas Size 3T

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Adidas

Size 3T
$17.99 $34

$14.39 20% off with

Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$12.99 $27

$10.39 20% off with

Cat & Jack Size 5

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Cat & Jack

Size 5
$9.99 $13

$7.99 20% off with

Nike Size 4T

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Nike

Size 4T
$11.99 $34

$9.59 20% off with

Under Armour Size 7

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Under Armour

Size 7
$20.99 $41

$16.79 20% off with

Adidas Size 2T

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Adidas

Size 2T
$9.99 $27

$7.99 20% off with

Nike Size 3T

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Nike

Size 3T
$9.99 $27

$7.99 20% off with

Puma Size 10

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Puma

Size 10
$11.99 $33

$9.59 20% off with

Disney Size 12 mo

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Disney

Size 12 mo
$8.99 $11
Nike Size Medium kids

View Product: Nike Size Medium kids

Nike

Size Medium kids
$13.99 $27

$11.19 20% off with

Matt's Scooter Size 18 mo

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Matt's Scooter

Size 18 mo
$10.99 $27

$8.79 20% off with

Crewcuts Size 4

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Crewcuts

Size 4
$15.99 $55

$12.79 20% off with

Nike Size 5

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Nike

Size 5
$18.99 $45

$15.19 20% off with

Nike Size 6

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Nike

Size 6
$13.99 $27

$11.19 20% off with

Xersion Size 10

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Xersion

Size 10
$12.99 $25

$10.39 20% off with

Kerrits Size Large kids

View Product: Kerrits Size Large kids

Kerrits

Size Large kids
$16.99 $33

$13.59 20% off with

Under Armour Size 6

View Product: Under Armour Size 6

Under Armour

Size 6
$20.99 $41

$16.79 20% off with

Gap Kids Size Large kids

View Product: Gap Kids Size Large kids

Gap Kids

Size Large kids
$15.99 $43

$12.79 20% off with

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