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.

19,178 items·
Filtering byBoys: activewear
    Baby Gap Size 3-6 mo
    Price Drop BadgePrice Drop

    View Product: Baby Gap Size 3-6 mo

    Baby Gap

    Size 3-6 mo
    $14.99 $40

    $6.00 60% off with

    Jumping Beans Size 6

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    Jumping Beans

    Size 6
    $9.99 $16
    Nike Size 3T

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    Nike

    Size 3T
    $17.99 $43

    $12.59 30% off with

    Heat Gear by Under Armour Size Large youth

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    Heat Gear by Under Armour

    Size Large youth
    $9.99 $31

    $5.99 40% off with

    Carter's Size 2T

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    Carter's

    Size 2T
    $11.99 $27

    $8.39 30% off with

    Under Armour Size 24 mo

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    Under Armour

    Size 24 mo
    $11.99 $17

    $8.39 30% off with

    Active by Old Navy Size 12

    View Product: Active by Old Navy Size 12

    Active by Old Navy

    Size 12
    $7.99 $19

    $5.59 30% off with

    Russell Athletic Size 6

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    Russell Athletic

    Size 6
    $7.99 $15

    $5.59 30% off with

    Head Size Small kids

    View Product: Head Size Small kids

    Head

    Size Small kids
    $10.99 $21

    $7.69 30% off with

    Genuine Merchandise by Gen2 Size 10

    View Product: Genuine Merchandise by Gen2 Size 10

    Genuine Merchandise by Gen2

    Size 10
    $7.99 $23

    $5.59 30% off with

    Under Armour Size Large youth

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    Under Armour

    Size Large youth
    $12.99 $38

    $7.79 40% off with

    Jordan Size 12 mo

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    Jordan

    Size 12 mo
    $18.99 $27

    $11.39 40% off with

    Crazy 8 Size 5

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    Crazy 8

    Size 5
    $11.99 $20

    $7.19 40% off with

    Polo by Ralph Lauren Size 18 mo

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    Polo by Ralph Lauren

    Size 18 mo
    $10.99 $34

    $6.59 40% off with

    Nike Size Large kids

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    Nike

    Size Large kids
    $11.99 $38

    $8.39 30% off with

    Nike Size 6

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    Nike

    Size 6
    $9.99 $38

    $5.99 40% off with

    Nike Size Medium kids

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    Nike

    Size Medium kids
    $9.99 $25

    $5.99 40% off with

    Assorted Brands Size Medium youth

    View Product: Assorted Brands Size Medium youth

    Assorted Brands

    Size Medium youth
    $8.99 $31

    $6.29 30% off with

    Fila Size 7

    View Product: Fila Size 7

    Fila

    Size 7
    $8.99 $38

    $6.29 30% off with

    Adidas Size Small kids

    View Product: Adidas Size Small kids

    Adidas

    Size Small kids
    $8.99 $21

    $6.29 30% off with

    Jordan Size Medium kids
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    View Product: Jordan Size Medium kids

    Jordan

    Size Medium kids
    $11.99 $41

    $7.19 40% off with

    Baby Gap Size 0-3 mo

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    Baby Gap

    Size 0-3 mo
    $36.99 $88

    $25.89 30% off with

    Roots 73 Size X-Large kids

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    Roots 73

    Size X-Large kids
    $36.99 $77

    $22.19 40% off with

    John Varvatos Star U.S.A Size 4

    View Product: John Varvatos Star U.S.A Size 4

    John Varvatos Star U.S.A

    Size 4
    $25.99 $102

    $15.59 40% off with

    The Children's Place Size 4

    View Product: The Children's Place Size 4

    The Children's Place

    Size 4
    $9.99 $30

    $6.99 30% off with

    Carter's Size 3

    View Product: Carter's Size 3

    Carter's

    Size 3
    $9.99 $26

    $6.99 30% off with

    Head Size Medium kids

    View Product: Head Size Medium kids

    Head

    Size Medium kids
    $14.99 $38

    $10.49 30% off with

    Marvel Size Large kids
    New With Tags BadgeNew With Tags

    View Product: Marvel Size Large kids

    Marvel

    Size Large kids
    $23.99 $52

    $16.79 30% off with

    OshKosh B'gosh Size 3T

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    OshKosh B'gosh

    Size 3T
    $14.99 $26

    $10.49 30% off with

    Under Armour Size 6

    View Product: Under Armour Size 6

    Under Armour

    Size 6
    $18.99 $38

    $13.29 30% off with

    Under Armour Size Small youth

    View Product: Under Armour Size Small youth

    Under Armour

    Size Small youth
    $11.99 $26

    $8.39 30% off with

    Carter's Size 6 mo

    View Product: Carter's Size 6 mo

    Carter's

    Size 6 mo
    $9.99 $20
    Under Armour Size 7

    View Product: Under Armour Size 7

    Under Armour

    Size 7
    $13.99 $38

    $9.79 30% off with

    Old Navy Size 3-6 mo

    View Product: Old Navy Size 3-6 mo

    Old Navy

    Size 3-6 mo
    $10.99 $20
    Active by Old Navy Size Small kids

    View Product: Active by Old Navy Size Small kids

    Active by Old Navy

    Size Small kids
    $6.99 $11
    Adidas Size 4T

    View Product: Adidas Size 4T

    Adidas

    Size 4T
    $10.99 $32

    $7.69 30% off with

    Under Armour Size 3T

    View Product: Under Armour Size 3T

    Under Armour

    Size 3T
    $18.99 $43

    $13.29 30% off with

    Nike Size Small kids

    View Product: Nike Size Small kids

    Nike

    Size Small kids
    $10.99 $25

    $7.69 30% off with

    Champion Size 16

    View Product: Champion Size 16

    Champion

    Size 16
    $6.99 $10
    Heat Gear by Under Armour Size 4T

    View Product: Heat Gear by Under Armour Size 4T

    Heat Gear by Under Armour

    Size 4T
    $9.99 $26

    $6.99 30% off with

    SONOMA life + style Size 5

    View Product: SONOMA life + style Size 5

    SONOMA life + style

    Size 5
    $10.99 $13
    Heat Gear by Under Armour Size Medium youth

    View Product: Heat Gear by Under Armour Size Medium youth

    Heat Gear by Under Armour

    Size Medium youth
    $13.99 $20

    $9.79 30% off with

    Heat Gear by Under Armour Size X-Small youth

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

    Heat Gear by Under Armour

    Size X-Small youth
    $14.99 $31

    $10.49 30% off with

    Carter's Size Newborn

    View Product: Carter's Size Newborn

    Carter's

    Size Newborn
    $9.99 $20
    Eddie Bauer Size 5

    View Product: Eddie Bauer Size 5

    Eddie Bauer

    Size 5
    $10.99 $34

    $7.69 30% off with

    Adidas Size 3T

    View Product: Adidas Size 3T

    Adidas

    Size 3T
    $9.99 $21
    Nike Size 4

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    Nike

    Size 4
    $12.99 $32

    $9.09 30% off with

    Nike Size 6

    View Product: Nike Size 6

    Nike

    Size 6
    $10.99 $25

    $7.69 30% off with

    Carter's Size 12 mo

    View Product: Carter's Size 12 mo

    Carter's

    Size 12 mo
    $6.99 $20
    Nike Size Medium youth

    View Product: Nike Size Medium youth

    Nike

    Size Medium youth
    $14.99 $38

    $10.49 30% off with