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.

38 items
Gap Size 4
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View Product: Gap Size 4

Gap

Size 4
$13.99 $40

$8.39 40% off with

Old Navy Size 4T
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View Product: Old Navy Size 4T

Old Navy

Size 4T
$6.99 $17
Circo Size 4T
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View Product: Circo Size 4T

Circo

Size 4T
$8.99 $17
Baby Gap Size 4
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View Product: Baby Gap Size 4

Baby Gap

Size 4
$8.99 $30

$6.29 30% off with

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

Carter's

Size 4T
$6.99 $28
Carter's Size 4T
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View Product: Carter's Size 4T

Carter's

Size 4T
$11.99 $34

$8.39 30% off with

Lands' End Size 4
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View Product: Lands' End Size 4

Lands' End

Size 4
$12.99 $39

$7.79 40% off with

Marvel Size 4T
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View Product: Marvel Size 4T

Marvel

Size 4T
$10.99 $26

$6.59 40% off with

Hurley Size 4T
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View Product: Hurley Size 4T

Hurley

Size 4T
$15.99 $51

$9.59 40% off with

Cat & Jack Size 4
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View Product: Cat & Jack Size 4

Cat & Jack

Size 4
$7.99 $17

$6.39 20% off with

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

Carter's

Size 4T
$10.99 $26

$8.79 20% off with

OshKosh B'gosh Size 4
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View Product: OshKosh B'gosh Size 4

OshKosh B'gosh

Size 4
$12.99 $34

$7.79 40% off with

Crewcuts Outlet Size 4
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View Product: Crewcuts Outlet Size 4

Crewcuts Outlet

Size 4
$10.99 $19

$8.79 20% off with

Majestic Size 4T
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View Product: Majestic Size 4T

Majestic

Size 4T
$4.99 $34
Carter's Size 4
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View Product: Carter's Size 4

Carter's

Size 4
$8.99 $34

$6.29 30% off with

Spiritual Gangster Size 4T
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View Product: Spiritual Gangster Size 4T

Spiritual Gangster

Size 4T
$10.99 $43

$6.59 40% off with

Assorted Brands Size 4
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View Product: Assorted Brands Size 4

Assorted Brands

Size 4
$11.99 $26

$5.99 50% off with

Baby Gap Size 4T
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View Product: Baby Gap Size 4T

Baby Gap

Size 4T
$11.99 $30

$8.39 30% off with

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

Carter's

Size 4T
$8.99 $34

$6.29 30% off with

Atlantis Size 4T
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View Product: Atlantis Size 4T

Atlantis

Size 4T
$9.99 $43

$5.99 40% off with

Gymboree Size 4
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View Product: Gymboree Size 4

Gymboree

Size 4
$9.99 $35

$5.99 40% off with

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

Carter's

Size 4T
$8.99 $28

$6.29 30% off with

Assorted Brands Size 4T
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View Product: Assorted Brands Size 4T

Assorted Brands

Size 4T
$9.99 $34

$5.99 40% off with

H&M Size 4
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View Product: H&M Size 4

H&M

Size 4
$11.99 $26

$8.39 30% off with

Baby Gap Size 4
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View Product: Baby Gap Size 4

Baby Gap

Size 4
$9.99 $30

$5.99 40% off with

OshKosh B'gosh Size 4
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View Product: OshKosh B'gosh Size 4

OshKosh B'gosh

Size 4
$9.99 $34

$5.99 40% off with

An Original Penguin by Munsingwear Size 4
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View Product: An Original Penguin by Munsingwear Size 4

An Original Penguin by Munsingwear

Size 4
$8.99 $34

$6.29 30% off with

Heat Gear by Under Armour Size 4T
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View Product: Heat Gear by Under Armour Size 4T

Heat Gear by Under Armour

Size 4T
$7.99 $26

$6.39 20% off with

Hurlu Berlu Size 4
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View Product: Hurlu Berlu Size 4

Hurlu Berlu

Size 4
$8.99 $34

$6.29 30% off with

Rabbit Skins Size 4
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View Product: Rabbit Skins Size 4

Rabbit Skins

Size 4
$7.99 $17

$6.39 20% off with

Nike Size 4
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View Product: Nike Size 4

Nike

Size 4
$8.99 $32

$6.29 30% off with

Gap Kids Size 4
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View Product: Gap Kids Size 4

Gap Kids

Size 4
$6.99 $20
PLACE Sport Size 4
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View Product: PLACE Sport Size 4

PLACE Sport

Size 4
$4.99 $11
Athletic Works Size 4
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View Product: Athletic Works Size 4

Athletic Works

Size 4
$4.99 $9
Adidas Size 4T
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View Product: Adidas Size 4T

Adidas

Size 4T
$7.99 $32

$6.39 20% off with

Arizona Jean Company Size 4T
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View Product: Arizona Jean Company Size 4T

Arizona Jean Company

Size 4T
$7.99 $17
Gymboree Size 4T
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View Product: Gymboree Size 4T

Gymboree

Size 4T
$8.99 $35

$6.29 30% off with

Colosseum Athletics Size 4T
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View Product: Colosseum Athletics Size 4T

Colosseum Athletics

Size 4T
$7.99 $26

$6.39 20% off with