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.

2,679 items
Abercrombie Size 13
Abercrombie Size 13

View Product: Abercrombie Size 13

Abercrombie

Size 13
$18.99 $40
Heat Gear by Under Armour Size Medium youth
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
$21.99 $41
Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$15.99 $26
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
$19.99 $38
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
$16.99 $31
Puma Size X-Large youth
Puma Size X-Large youth

View Product: Puma Size X-Large youth

Puma

Size X-Large youth
$20.99 $41
Under Armour Size 7
Under Armour Size 7

View Product: Under Armour Size 7

Under Armour

Size 7
$18.99 $38
Under Armour Size 7
Under Armour Size 7

View Product: Under Armour Size 7

Under Armour

Size 7
$18.99 $38
Nike Size Small youth
Nike Size Small youth

View Product: Nike Size Small youth

Nike

Size Small youth
$16.99 $25
Nike Size Medium kids
Nike Size Medium kids

View Product: Nike Size Medium kids

Nike

Size Medium kids
$21.99 $51
Nike Size Small youth
Nike Size Small youth

View Product: Nike Size Small youth

Nike

Size Small youth
$19.99 $38
Old Navy Size X-Small  kids
Old Navy Size X-Small  kids

View Product: Old Navy Size X-Small kids

Old Navy

Size X-Small kids
$7.99 $10
Polarn O. Pyret Size 0-3 mo
Polarn O. Pyret Size 0-3 mo

View Product: Polarn O. Pyret Size 0-3 mo

Polarn O. Pyret

Size 0-3 mo
$19.99 $51
Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$24.99 $38
Disney Baby Size 12 mo
Disney Baby Size 12 mo

View Product: Disney Baby Size 12 mo

Disney Baby

Size 12 mo
$9.99 $10
Assorted Brands Size 18
Assorted Brands Size 18

View Product: Assorted Brands Size 18

Assorted Brands

Size 18
$37.99 $61
Puma Size 12 mo
Puma Size 12 mo

View Product: Puma Size 12 mo

Puma

Size 12 mo
$12.99 $14
Old Navy Size Large youth
Old Navy Size Large youth

View Product: Old Navy Size Large youth

Old Navy

Size Large youth
$9.99 $11
Russell Athletic Size 18
Russell Athletic Size 18

View Product: Russell Athletic Size 18

Russell Athletic

Size 18
$13.99 $20
Puma Size X-Large youth
Puma Size X-Large youth

View Product: Puma Size X-Large youth

Puma

Size X-Large youth
$15.99 $41
Russell Athletic Size 10
Russell Athletic Size 10

View Product: Russell Athletic Size 10

Russell Athletic

Size 10
$10.99 $15
The Children's Place Size 5
The Children's Place Size 5

View Product: The Children's Place Size 5

The Children's Place

Size 5
$10.99 $15
Tea Size 4
Tea Size 4

View Product: Tea Size 4

Tea

Size 4
$19.99 $30
Walmart Size 2T
Walmart Size 2T

View Product: Walmart Size 2T

Walmart

Size 2T
$9.99 $10
Under Armour Size 24 mo
Under Armour Size 24 mo

View Product: Under Armour Size 24 mo

Under Armour

Size 24 mo
$13.99 $26
Puma Size 3T
Puma Size 3T

View Product: Puma Size 3T

Puma

Size 3T
$10.99 $17
Nickelodeon Size 4T
Nickelodeon Size 4T

View Product: Nickelodeon Size 4T

Nickelodeon

Size 4T
$15.99 $26
Adidas Size 6 mo
Adidas Size 6 mo

View Product: Adidas Size 6 mo

Adidas

Size 6 mo
$12.99 $26
Champion Size Medium youth
Champion Size Medium youth

View Product: Champion Size Medium youth

Champion

Size Medium youth
$13.99 $20
Nike Size Medium youth
Nike Size Medium youth

View Product: Nike Size Medium youth

Nike

Size Medium youth
$22.99 $51
Crazy 8 Size 7
Crazy 8 Size 7

View Product: Crazy 8 Size 7

Crazy 8

Size 7
$11.99 $17
Xersion Size Medium kids
Xersion Size Medium kids

View Product: Xersion Size Medium kids

Xersion

Size Medium kids
$11.99 $15
Epic Threads Size 5
Epic Threads Size 5

View Product: Epic Threads Size 5

Epic Threads

Size 5
$14.99 $26
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$17.99 $38
Russell Athletic Size X-Large youth
Russell Athletic Size X-Large youth

View Product: Russell Athletic Size X-Large youth

Russell Athletic

Size X-Large youth
$13.99 $20
Star Wars Size 4T
Star Wars Size 4T

View Product: Star Wars Size 4T

Star Wars

Size 4T
$13.99 $17
Gap Fit Size X-Large youth
Gap Fit Size X-Large youth

View Product: Gap Fit Size X-Large youth

Gap Fit

Size X-Large youth
$16.99 $38
CB Sports Size 10
CB Sports Size 10

View Product: CB Sports Size 10

CB Sports

Size 10
$17.99 $26
Old Navy Size 6
Old Navy Size 6

View Product: Old Navy Size 6

Old Navy

Size 6
$12.99 $20
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$19.99 $38
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$16.99 $38
Under Armour Size Large youth
Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$24.99 $51
New Balance Size 2T
New Balance Size 2T

View Product: New Balance Size 2T

New Balance

Size 2T
$17.99 $31
Carter's Size 6 mo
Carter's Size 6 mo

View Product: Carter's Size 6 mo

Carter's

Size 6 mo
$10.99 $20
Colosseum Athletics Size 8
Colosseum Athletics Size 8

View Product: Colosseum Athletics Size 8

Colosseum Athletics

Size 8
$18.99 $41
Old Navy Size Large kids
Old Navy Size Large kids

View Product: Old Navy Size Large kids

Old Navy

Size Large kids
$11.99 $20
Team Athletics Size 18
Team Athletics Size 18

View Product: Team Athletics Size 18

Team Athletics

Size 18
$14.99 $20
Adidas Size X-Large youth
Adidas Size X-Large youth

View Product: Adidas Size X-Large youth

Adidas

Size X-Large youth
$15.99 $38
Jordan Size 6
Jordan Size 6

View Product: Jordan Size 6

Jordan

Size 6
$24.99 $61
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$16.99 $38
Assorted Brands Size 6
Assorted Brands Size 6

View Product: Assorted Brands Size 6

Assorted Brands

Size 6
$16.99 $31
Assorted Brands Size 6
Assorted Brands Size 6

View Product: Assorted Brands Size 6

Assorted Brands

Size 6
$18.99 $31
Nike Size 7
Nike Size 7

View Product: Nike Size 7

Nike

Size 7
$18.99 $51
Mambo Size Small youth
Mambo Size Small youth

View Product: Mambo Size Small youth

Mambo

Size Small youth
$18.99 $41
Nike Size Medium youth
Nike Size Medium youth

View Product: Nike Size Medium youth

Nike

Size Medium youth
$17.99 $38
Heat Gear by Under Armour Size Medium youth
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
$15.99 $31
Adidas Size 10
Adidas Size 10

View Product: Adidas Size 10

Adidas

Size 10
$21.99 $51
Adidas Size 14
Adidas Size 14

View Product: Adidas Size 14

Adidas

Size 14
$23.99 $38
Adidas Size 10
Adidas Size 10
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View Product: Adidas Size 10

Adidas

Size 10
$23.99 $38
Under Armour Size Small youth
Under Armour Size Small youth

View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$15.99 $26
Under Armour Size Small youth
Under Armour Size Small youth

View Product: Under Armour Size Small youth

Under Armour

Size Small youth
$17.99 $26
Old Navy Size 5
Old Navy Size 5

View Product: Old Navy Size 5

Old Navy

Size 5
$9.99 $10
Nike Size Medium kids
Nike Size Medium kids

View Product: Nike Size Medium kids

Nike

Size Medium kids
$22.99 $51
Puma Size Medium kids
Puma Size Medium kids

View Product: Puma Size Medium kids

Puma

Size Medium kids
$20.99 $41
ProTime Sport Size Medium kids
ProTime Sport Size Medium kids

View Product: ProTime Sport Size Medium kids

ProTime Sport

Size Medium kids
$9.99 $10
Spyder Size 16
Spyder Size 16

View Product: Spyder Size 16

Spyder

Size 16
$53.99 $153
Universal Studios Kids Size Medium youth
Universal Studios Kids Size Medium youth

View Product: Universal Studios Kids Size Medium youth

Universal Studios Kids

Size Medium youth
$12.99 $20
Adidas Size 7
Adidas Size 7

View Product: Adidas Size 7

Adidas

Size 7
$21.99 $51
Gymboree Size 5
Gymboree Size 5

View Product: Gymboree Size 5

Gymboree

Size 5
$10.99 $20
Old Navy Size Medium youth
Old Navy Size Medium youth

View Product: Old Navy Size Medium youth

Old Navy

Size Medium youth
$11.99 $20
Adidas Size 10
Adidas Size 10

View Product: Adidas Size 10

Adidas

Size 10
$21.99 $38
Assorted Brands Size 6
Assorted Brands Size 6

View Product: Assorted Brands Size 6

Assorted Brands

Size 6
$17.99 $31
Nike Size 12 mo
Nike Size 12 mo

View Product: Nike Size 12 mo

Nike

Size 12 mo
$15.99 $25
H&M Size 6
H&M Size 6

View Product: H&M Size 6

H&M

Size 6
$15.99 $23
Air Jordan Size 6-9 mo
Air Jordan Size 6-9 mo

View Product: Air Jordan Size 6-9 mo

Air Jordan

Size 6-9 mo
$17.99 $27
Adidas Size 4T
Adidas Size 4T

View Product: Adidas Size 4T

Adidas

Size 4T
$19.99 $32
Russell Athletic Size Medium kids
Russell Athletic Size Medium kids

View Product: Russell Athletic Size Medium kids

Russell Athletic

Size Medium kids
$10.99 $15
Adidas Size 10
Adidas Size 10

View Product: Adidas Size 10

Adidas

Size 10
$14.99 $26
Old Navy Size 2T
Old Navy Size 2T

View Product: Old Navy Size 2T

Old Navy

Size 2T
$11.99 $17
Adidas Size Small youth
Adidas Size Small youth

View Product: Adidas Size Small youth

Adidas

Size Small youth
$14.99 $26
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$17.99 $26
Athletic Works Size 10
Athletic Works Size 10

View Product: Athletic Works Size 10

Athletic Works

Size 10
$9.99 $10
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$13.99 $25
FLOW SOCIETY Size Small youth
FLOW SOCIETY Size Small youth

View Product: FLOW SOCIETY Size Small youth

FLOW SOCIETY

Size Small youth
$16.99 $26
C9 By Champion Size 6
C9 By Champion Size 6

View Product: C9 By Champion Size 6

C9 By Champion

Size 6
$12.99 $15
Arctix Size X-Small youth
Arctix Size X-Small youth

View Product: Arctix Size X-Small youth

Arctix

Size X-Small youth
$21.99 $31
Active by Old Navy Size Small youth
Active by Old Navy Size Small youth

View Product: Active by Old Navy Size Small youth

Active by Old Navy

Size Small youth
$14.99 $19
Jumping Beans Size 3T
Jumping Beans Size 3T

View Product: Jumping Beans Size 3T

Jumping Beans

Size 3T
$13.99 $13
Baby Gap Size 4
Baby Gap Size 4

View Product: Baby Gap Size 4

Baby Gap

Size 4
$11.99 $18
Puma Size 4
Puma Size 4

View Product: Puma Size 4

Puma

Size 4
$12.99 $26
DSG Size Medium youth
DSG Size Medium youth
New With Tags BadgeNew With Tags

View Product: DSG Size Medium youth

DSG

Size Medium youth
$15.99 $30
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
Adidas Size Small kids
Adidas Size Small kids

View Product: Adidas Size Small kids

Adidas

Size Small kids
$15.99 $32
The Children's Place Size Medium kids
The Children's Place Size Medium kids

View Product: The Children's Place Size Medium kids

The Children's Place

Size Medium kids
$15.99 $30
CALVIN KLEIN JEANS Size 3-6 mo
CALVIN KLEIN JEANS Size 3-6 mo

View Product: CALVIN KLEIN JEANS Size 3-6 mo

CALVIN KLEIN JEANS

Size 3-6 mo
$8.99 $15
Adidas Size 14
Adidas Size 14

View Product: Adidas Size 14

Adidas

Size 14
$14.99 $26
Athletic Works Size 14
Athletic Works Size 14

View Product: Athletic Works Size 14

Athletic Works

Size 14
$10.99 $10
C9 By Champion Size 4
C9 By Champion Size 4

View Product: C9 By Champion Size 4

C9 By Champion

Size 4
$8.99 $9
Under Armour Size Large youth
Under Armour Size Large youth

View Product: Under Armour Size Large youth

Under Armour

Size Large youth
$19.99 $38
Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$19.99 $38
Gap Fit Size Medium youth
Gap Fit Size Medium youth

View Product: Gap Fit Size Medium youth

Gap Fit

Size Medium youth
$17.99 $26
Under Armour Size 6
Under Armour Size 6

View Product: Under Armour Size 6

Under Armour

Size 6
$24.99 $51
Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$28.99 $38
Under Armour Size Medium youth
Under Armour Size Medium youth

View Product: Under Armour Size Medium youth

Under Armour

Size Medium youth
$18.99 $38
Reebok Size 8
Reebok Size 8

View Product: Reebok Size 8

Reebok

Size 8
$11.99 $26
Adidas Size 18 mo
Adidas Size 18 mo

View Product: Adidas Size 18 mo

Adidas

Size 18 mo
$14.99 $34
Champion Size Small youth
Champion Size Small youth

View Product: Champion Size Small youth

Champion

Size Small youth
$11.99 $10
Adidas Size 2T
Adidas Size 2T

View Product: Adidas Size 2T

Adidas

Size 2T
$12.99 $26
Adidas Size 18 mo
Adidas Size 18 mo

View Product: Adidas Size 18 mo

Adidas

Size 18 mo
$10.99 $17
Adidas Size 2T
Adidas Size 2T

View Product: Adidas Size 2T

Adidas

Size 2T
$13.99 $17
Batman Size 3T
Batman Size 3T

View Product: Batman Size 3T

Batman

Size 3T
$10.99 $13
Okie Dokie Size 3T
Okie Dokie Size 3T

View Product: Okie Dokie Size 3T

Okie Dokie

Size 3T
$9.99 $10
Healthtex Size 3T
Healthtex Size 3T

View Product: Healthtex Size 3T

Healthtex

Size 3T
$9.99 $13
Puma Size 24 mo
Puma Size 24 mo

View Product: Puma Size 24 mo

Puma

Size 24 mo
$9.99 $14
Adidas Size 24 mo
Adidas Size 24 mo

View Product: Adidas Size 24 mo

Adidas

Size 24 mo
$10.99 $17
Cat & Jack Size 6
Cat & Jack Size 6

View Product: Cat & Jack Size 6

Cat & Jack

Size 6
$11.99 $15
Nike Size Large youth
Nike Size Large youth

View Product: Nike Size Large youth

Nike

Size Large youth
$22.99 $38
Champion Size Large youth
Champion Size Large youth

View Product: Champion Size Large youth

Champion

Size Large youth
$12.99 $20
Champion Size Large youth
Champion Size Large youth

View Product: Champion Size Large youth

Champion

Size Large youth
$13.99 $15
Champion Size Large youth
Champion Size Large youth
New With Tags BadgeNew With Tags

View Product: Champion Size Large youth

Champion

Size Large youth
$22.99 $28
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