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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.

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29,524 items
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REI Size X-Small kids
REI Size X-Small kids

View Product: REI Size X-Small kids

REI

Size X-Small kids
$10.99 $21

$8.79 20% off with

Athleta Size 6
Athleta Size 6
Price Drop BadgePrice Drop

View Product: Athleta Size 6

Athleta

Size 6
$11.99 $46

$7.19 40% off with

Desigual Size 9
Desigual Size 9

View Product: Desigual Size 9

Desigual

Size 9
$17.99 $61

$14.39 20% off with

Adidas Size 3T
Adidas Size 3T

View Product: Adidas Size 3T

Adidas

Size 3T
$12.99 $32

$9.09 30% off with

Under Armour Size X-Large youth
Under Armour Size X-Large youth

View Product: Under Armour Size X-Large youth

Under Armour

Size X-Large youth
$20.99 $51
Adidas Size 5
Adidas Size 5

View Product: Adidas Size 5

Adidas

Size 5
$13.99 $43

$11.19 20% off with

Adidas Size 5
Adidas Size 5

View Product: Adidas Size 5

Adidas

Size 5
$10.99 $32

$8.79 20% off with

Champion Size Small youth
Champion Size Small youth

View Product: Champion Size Small youth

Champion

Size Small youth
$8.99 $15

$6.29 30% off with

Under Armour Size X-Large youth
Under Armour Size X-Large youth

View Product: Under Armour Size X-Large youth

Under Armour

Size X-Large youth
$20.99 $38

$16.79 20% off with

Active by Old Navy Size Medium kids
Active by Old Navy Size Medium kids

View Product: Active by Old Navy Size Medium kids

Active by Old Navy

Size Medium kids
$9.99 $19

$7.99 20% off with

Active by Old Navy Size Small kids
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

$5.59 20% off with

Athletic Works Size 6
Athletic Works Size 6

View Product: Athletic Works Size 6

Athletic Works

Size 6
$9.99 $15

$7.99 20% off with

Spyder Size X-Small youth
Spyder Size X-Small youth
Price Drop BadgePrice Drop

View Product: Spyder Size X-Small youth

Spyder

Size X-Small youth
$15.99 $77

$7.99 50% off with

Adidas Size 8
Adidas Size 8

View Product: Adidas Size 8

Adidas

Size 8
$17.99 $51

$14.39 20% off with

Under Armour Size 4
Under Armour Size 4
Price Drop BadgePrice Drop

View Product: Under Armour Size 4

Under Armour

Size 4
$11.99 $32

$7.19 40% off with

Adidas Size 8
Adidas Size 8

View Product: Adidas Size 8

Adidas

Size 8
$10.99 $26

$6.59 40% off with

Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$19.99 $51

$13.99 30% off with

Nike Size 6 mo
Nike Size 6 mo

View Product: Nike Size 6 mo

Nike

Size 6 mo
$12.99 $26

$10.39 20% off with

Nike Size 4T
Nike Size 4T

View Product: Nike Size 4T

Nike

Size 4T
$13.99 $32

$11.19 20% off with

Adidas Size 10
Adidas Size 10

View Product: Adidas Size 10

Adidas

Size 10
$12.99 $38

$10.39 20% off with

Nike Size 8
Nike Size 8

View Product: Nike Size 8

Nike

Size 8
$13.99 $38

$9.79 30% off with

Nike Size 4T
Nike Size 4T

View Product: Nike Size 4T

Nike

Size 4T
$13.99 $32

$11.19 20% off with

Under Armour Size Small youth
Under Armour Size Small youth

View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$19.99 $38

$15.99 20% off with

Adidas Size 6
Adidas Size 6

View Product: Adidas Size 6

Adidas

Size 6
$9.99 $26

$7.99 20% off with

Adidas Size Medium kids
Adidas Size Medium kids

View Product: Adidas Size Medium kids

Adidas

Size Medium kids
$15.99 $26

$12.79 20% off with

Under Armour Size 6
Under Armour Size 6

View Product: Under Armour Size 6

Under Armour

Size 6
$14.99 $38

$11.99 20% off with

Nike Size 3T
Nike Size 3T
Price Drop BadgePrice Drop

View Product: Nike Size 3T

Nike

Size 3T
$11.99 $32

$7.19 40% off with

Nike Size X-Small youth
Nike Size X-Small youth

View Product: Nike Size X-Small youth

Nike

Size X-Small youth
$13.99 $38

$11.19 20% off with

Hanes Size 10
Hanes Size 10

View Product: Hanes Size 10

Hanes

Size 10
$7.99 $15

$5.59 30% off with

Heat Gear by Under Armour Size X-Large youth
Heat Gear by Under Armour Size X-Large youth

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

Heat Gear by Under Armour

Size X-Large youth
$13.99 $31

$11.19 20% off with

Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$14.99 $38

$11.99 20% off with

Under Armour Size 7
Under Armour Size 7

View Product: Under Armour Size 7

Under Armour

Size 7
$13.99 $38

$11.19 20% off with

Under Armour Size 7
Under Armour Size 7

View Product: Under Armour Size 7

Under Armour

Size 7
$19.99 $51

$15.99 20% off with

Under Armour Size Large youth
Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$14.99 $38

$11.99 20% off with

Champion Size Small youth
Champion Size Small youth

View Product: Champion Size Small youth

Champion

Size Small youth
$7.99 $15

$6.39 20% off with

Adidas Size 6
Adidas Size 6

View Product: Adidas Size 6

Adidas

Size 6
$12.99 $38

$9.09 30% off with

Under Armour Size 7
Under Armour Size 7
Price Drop BadgePrice Drop

View Product: Under Armour Size 7

Under Armour

Size 7
$11.99 $38

$7.19 40% off with

Heat Gear by Under Armour Size Large youth
Heat Gear by Under Armour Size Large youth

View Product: Heat Gear by Under Armour Size Large youth

Heat Gear by Under Armour

Size Large youth
$11.99 $31

$9.59 20% off with

Under Armour Size 6
Under Armour Size 6

View Product: Under Armour Size 6

Under Armour

Size 6
$14.99 $38

$11.99 20% off with

Hanna Andersson Size 60 cm
Hanna Andersson Size 60 cm

View Product: Hanna Andersson Size 60 cm

Hanna Andersson

Size 60 cm
$9.99 $28

$5.99 40% off with

Under Armour Size Medium youth
Under Armour Size Medium youth
Price Drop BadgePrice Drop

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$11.99 $38

$7.19 40% off with

Old Navy Size 18
Old Navy Size 18

View Product: Old Navy Size 18

Old Navy

Size 18
$7.99 $20
Nike Size Small youth
Nike Size Small youth

View Product: Nike Size Small youth

Nike

Size Small youth
$17.99 $38

$14.39 20% off with

Old Navy Size 2T
Old Navy Size 2T

View Product: Old Navy Size 2T

Old Navy

Size 2T
$8.99 $20

$7.19 20% off with

Xersion Size 6
Xersion Size 6

View Product: Xersion Size 6

Xersion

Size 6
$8.99 $23

$7.19 20% off with

Gap Kids Outlet Size 6
Gap Kids Outlet Size 6

View Product: Gap Kids Outlet Size 6

Gap Kids Outlet

Size 6
$9.99 $26
Active by Old Navy Size 8
Active by Old Navy Size 8

View Product: Active by Old Navy Size 8

Active by Old Navy

Size 8
$8.99 $19

$7.19 20% off with

Nike Size 7
Nike Size 7

View Product: Nike Size 7

Nike

Size 7
$17.99 $51

$14.39 20% off with

Uniqlo Size 7
Uniqlo Size 7
Price Drop BadgePrice Drop

View Product: Uniqlo Size 7

Uniqlo

Size 7
$6.99 $23

$5.59 20% off with

Polo by Ralph Lauren Size 2T
Polo by Ralph Lauren Size 2T

View Product: Polo by Ralph Lauren Size 2T

Polo by Ralph Lauren

Size 2T
$17.99 $50

$10.79 40% off with

...