thredUP LogothredUP | An Online Consignment & Thrift StorethredUP
Magnifying glassMagnifying glass icon
My thredUPMy thredUP Icon
0
CartLink to your thredUP cart
Check out

Boys' Board Shorts

ChevronNavigation chevron icon

Shop thredUP for designer brands in boys' board shorts, including Circo and Baby Gap. Get pre-loved swimwear for boys big and small at up to 90% off estimated retail prices.

2,215 items
Carter's Size 24 mo
Carter's Size 24 mo

View Product: Carter's Size 24 mo

Carter's

Size 24 mo
$9.99 $24

$6.99 30% off with

Old Navy Size 10
Old Navy Size 10

View Product: Old Navy Size 10

Old Navy

Size 10
$10.99 $25

$7.69 30% off with

Wonder Nation Size 6
Wonder Nation Size 6

View Product: Wonder Nation Size 6

Wonder Nation

Size 6
$4.99 $10
Assorted Brands Size 2T
Assorted Brands Size 2T

View Product: Assorted Brands Size 2T

Assorted Brands

Size 2T
$4.99 $14
Op Size 10
Op Size 10

View Product: Op Size 10

Op

Size 10
$4.99 $10
Gymboree Size 18-24 mo
Gymboree Size 18-24 mo

View Product: Gymboree Size 18-24 mo

Gymboree

Size 18-24 mo
$7.99 $25

$6.39 20% off with

Wonder Nation Size 6
Wonder Nation Size 6

View Product: Wonder Nation Size 6

Wonder Nation

Size 6
$5.99 $10
Cat & Jack Size 12
Cat & Jack Size 12

View Product: Cat & Jack Size 12

Cat & Jack

Size 12
$6.99 $10
Disney Size 4
Disney Size 4

View Product: Disney Size 4

Disney

Size 4
$4.99 $9
OTB Size 10
OTB Size 10

View Product: OTB Size 10

OTB

Size 10
$4.99 $10
Art Class Size 12
Art Class Size 12

View Product: Art Class Size 12

Art Class

Size 12
$7.99 $13

$6.39 20% off with

Carter's Size 4T
Carter's Size 4T

View Product: Carter's Size 4T

Carter's

Size 4T
$7.99 $24

$6.39 20% off with

Under Armour Size 16
Under Armour Size 16

View Product: Under Armour Size 16

Under Armour

Size 16
$11.99 $26

$9.59 20% off with

Cat & Jack Size X-Small  kids
Cat & Jack Size X-Small  kids

View Product: Cat & Jack Size X-Small kids

Cat & Jack

Size X-Small kids
$4.99 $9
Cat & Jack Size 12
Cat & Jack Size 12

View Product: Cat & Jack Size 12

Cat & Jack

Size 12
$4.99 $10
Carter's Size 5T
Carter's Size 5T

View Product: Carter's Size 5T

Carter's

Size 5T
$7.99 $24

$6.39 20% off with

Carter's Size 10
Carter's Size 10

View Product: Carter's Size 10

Carter's

Size 10
$6.99 $24
Art Class Size 10
Art Class Size 10

View Product: Art Class Size 10

Art Class

Size 10
$5.99 $13
Cat & Jack Size 12
Cat & Jack Size 12

View Product: Cat & Jack Size 12

Cat & Jack

Size 12
$6.99 $10
Despicable Me Size 14
Despicable Me Size 14

View Product: Despicable Me Size 14

Despicable Me

Size 14
$5.99 $10
Gymboree Size 18-24 mo
Gymboree Size 18-24 mo

View Product: Gymboree Size 18-24 mo

Gymboree

Size 18-24 mo
$8.99 $25

$7.19 20% off with

PLACE Sport Size 10
PLACE Sport Size 10

View Product: PLACE Sport Size 10

PLACE Sport

Size 10
$6.99 $13
Assorted Brands Size Small kids
Assorted Brands Size Small kids

View Product: Assorted Brands Size Small kids

Assorted Brands

Size Small kids
$8.99 $17

$7.19 20% off with

Cherokee Size 6
Cherokee Size 6

View Product: Cherokee Size 6

Cherokee

Size 6
$5.99 $13
Wonder Nation Size 18
Wonder Nation Size 18

View Product: Wonder Nation Size 18

Wonder Nation

Size 18
$6.99 $10
Carter's Size 12 mo
Carter's Size 12 mo

View Product: Carter's Size 12 mo

Carter's

Size 12 mo
$8.99 $24

$7.19 20% off with

Joe Fresh Size 7
Joe Fresh Size 7

View Product: Joe Fresh Size 7

Joe Fresh

Size 7
$5.99 $15
Wonder Nation Size 6
Wonder Nation Size 6

View Product: Wonder Nation Size 6

Wonder Nation

Size 6
$5.99 $10
Carter's Size 9 mo
Carter's Size 9 mo

View Product: Carter's Size 9 mo

Carter's

Size 9 mo
$9.99 $24

$7.99 20% off with

Naartjie Kids Size 7
Naartjie Kids Size 7

View Product: Naartjie Kids Size 7

Naartjie Kids

Size 7
$5.99 $13
Andy & Evan Size 4T
Andy & Evan Size 4T

View Product: Andy & Evan Size 4T

Andy & Evan

Size 4T
$10.99 $43

$8.79 20% off with

Nickelodeon Size 3T
Nickelodeon Size 3T

View Product: Nickelodeon Size 3T

Nickelodeon

Size 3T
$6.99 $13
Assorted Brands Size 4
Assorted Brands Size 4

View Product: Assorted Brands Size 4

Assorted Brands

Size 4
$6.99 $17
Abercrombie Size 3
Abercrombie Size 3

View Product: Abercrombie Size 3

Abercrombie

Size 3
$9.99 $30

$7.99 20% off with

Carter's Size 18 mo
Carter's Size 18 mo

View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$8.99 $24

$7.19 20% off with

UV Skinz Size 3T
UV Skinz Size 3T

View Product: UV Skinz Size 3T

UV Skinz

Size 3T
$7.99 $21

$6.39 20% off with

Art Class Size 14
Art Class Size 14

View Product: Art Class Size 14

Art Class

Size 14
$9.99 $13

$7.99 20% off with

Assorted Brands Size 8
Assorted Brands Size 8

View Product: Assorted Brands Size 8

Assorted Brands

Size 8
$7.99 $20

$6.39 20% off with

Old Navy Size Large youth
Old Navy Size Large youth

View Product: Old Navy Size Large youth

Old Navy

Size Large youth
$10.99 $25

$8.79 20% off with

Rip Curl Size 4
Rip Curl Size 4

View Product: Rip Curl Size 4

Rip Curl

Size 4
$8.99 $26

$7.19 20% off with

Old Navy Size 12-18 mo
Old Navy Size 12-18 mo

View Product: Old Navy Size 12-18 mo

Old Navy

Size 12-18 mo
$6.99 $15
Laguna Size 8
Laguna Size 8

View Product: Laguna Size 8

Laguna

Size 8
$6.99 $15
Cat & Jack Size 6
Cat & Jack Size 6

View Product: Cat & Jack Size 6

Cat & Jack

Size 6
$6.99 $10
Kanu Surf Size 7
Kanu Surf Size 7

View Product: Kanu Surf Size 7

Kanu Surf

Size 7
$8.99 $20

$7.19 20% off with

Carter's Size 4T
Carter's Size 4T

View Product: Carter's Size 4T

Carter's

Size 4T
$8.99 $24

$7.19 20% off with

Superman Size 8
Superman Size 8

View Product: Superman Size 8

Superman

Size 8
$5.99 $10
Abercrombie Size 10
Abercrombie Size 10

View Product: Abercrombie Size 10

Abercrombie

Size 10
$9.99 $30

$7.99 20% off with

Quiksilver Size 6
Quiksilver Size 6

View Product: Quiksilver Size 6

Quiksilver

Size 6
$7.99 $20

$6.39 20% off with

Umbro Size 6
Umbro Size 6

View Product: Umbro Size 6

Umbro

Size 6
$5.99 $10
Hanna Andersson Size 110 cm
Hanna Andersson Size 110 cm

View Product: Hanna Andersson Size 110 cm

Hanna Andersson

Size 110 cm
$12.99 $28

$10.39 20% off with

Cat & Jack Size 6
Cat & Jack Size 6

View Product: Cat & Jack Size 6

Cat & Jack

Size 6
$6.99 $10
Unbranded Size 3T
Unbranded Size 3T

View Product: Unbranded Size 3T

Unbranded

Size 3T
$6.99 $17
Art Class Size 14
Art Class Size 14

View Product: Art Class Size 14

Art Class

Size 14
$6.99 $13
Cat & Jack Size 6
Cat & Jack Size 6

View Product: Cat & Jack Size 6

Cat & Jack

Size 6
$5.99 $10
Joe Boxer Size X-Large kids
Joe Boxer Size X-Large kids

View Product: Joe Boxer Size X-Large kids

Joe Boxer

Size X-Large kids
$4.99 $10
PLACE Sport Size 6
PLACE Sport Size 6

View Product: PLACE Sport Size 6

PLACE Sport

Size 6
$5.99 $13
Body Glove Size 7
Body Glove Size 7

View Product: Body Glove Size 7

Body Glove

Size 7
$6.99 $26
Baby Gap Size 5T
Baby Gap Size 5T

View Product: Baby Gap Size 5T

Baby Gap

Size 5T
$8.99 $20

$7.19 20% off with

Cat & Jack Size 3T
Cat & Jack Size 3T

View Product: Cat & Jack Size 3T

Cat & Jack

Size 3T
$4.99 $9
Crewcuts Size 8
Crewcuts Size 8

View Product: Crewcuts Size 8

Crewcuts

Size 8
$8.99 $31

$7.19 20% off with

OshKosh B'gosh Size 6-9 mo
OshKosh B'gosh Size 6-9 mo

View Product: OshKosh B'gosh Size 6-9 mo

OshKosh B'gosh

Size 6-9 mo
$6.99 $18
Wonder Nation Size 18
Wonder Nation Size 18

View Product: Wonder Nation Size 18

Wonder Nation

Size 18
$6.99 $10
Baby Gap Size 0-3 mo
Baby Gap Size 0-3 mo

View Product: Baby Gap Size 0-3 mo

Baby Gap

Size 0-3 mo
$4.99 $20
Wonder Nation Size 8
Wonder Nation Size 8

View Product: Wonder Nation Size 8

Wonder Nation

Size 8
$4.99 $10
Disney Size 4T
Disney Size 4T

View Product: Disney Size 4T

Disney

Size 4T
$4.99 $9
Under Armour Size 7
Under Armour Size 7

View Product: Under Armour Size 7

Under Armour

Size 7
$10.99 $26

$8.79 20% off with

PLACE Sport Size 10
PLACE Sport Size 10

View Product: PLACE Sport Size 10

PLACE Sport

Size 10
$5.99 $13
Lands' End Size 10
Lands' End Size 10

View Product: Lands' End Size 10

Lands' End

Size 10
$6.99 $20
Old Navy Size 10
Old Navy Size 10

View Product: Old Navy Size 10

Old Navy

Size 10
$10.99 $25

$8.79 20% off with

Marvel Size Small kids
Marvel Size Small kids

View Product: Marvel Size Small kids

Marvel

Size Small kids
$6.99 $17
Crewcuts Outlet Size 6
Crewcuts Outlet Size 6

View Product: Crewcuts Outlet Size 6

Crewcuts Outlet

Size 6
$7.99 $15

$6.39 20% off with

Carter's Size 18 mo
Carter's Size 18 mo

View Product: Carter's Size 18 mo

Carter's

Size 18 mo
$8.99 $24

$7.19 20% off with

Cat & Jack Size 3T
Cat & Jack Size 3T

View Product: Cat & Jack Size 3T

Cat & Jack

Size 3T
$5.99 $9
Unbranded Size 2T
Unbranded Size 2T

View Product: Unbranded Size 2T

Unbranded

Size 2T
$4.99 $14
Cat & Jack Size 8
Cat & Jack Size 8

View Product: Cat & Jack Size 8

Cat & Jack

Size 8
$5.99 $10
C-Life Group Size 5T
C-Life Group Size 5T

View Product: C-Life Group Size 5T

C-Life Group

Size 5T
$5.99 $9
UV Skinz Size 5
UV Skinz Size 5

View Product: UV Skinz Size 5

UV Skinz

Size 5
$7.99 $21

$6.39 20% off with

Old Navy Size 8
Old Navy Size 8

View Product: Old Navy Size 8

Old Navy

Size 8
$10.99 $25

$8.79 20% off with

Gap Kids Size Small youth
Gap Kids Size Small youth

View Product: Gap Kids Size Small youth

Gap Kids

Size Small youth
$11.99 $30

$9.59 20% off with

Despicable Me Size X-Small  kids
Despicable Me Size X-Small  kids

View Product: Despicable Me Size X-Small kids

Despicable Me

Size X-Small kids
$5.99 $9
Gap Kids Size Small youth
Gap Kids Size Small youth

View Product: Gap Kids Size Small youth

Gap Kids

Size Small youth
$10.99 $30

$8.79 20% off with

Gymboree Size 3T
Gymboree Size 3T

View Product: Gymboree Size 3T

Gymboree

Size 3T
$9.99 $25

$7.99 20% off with

Assorted Brands Size Small kids
Assorted Brands Size Small kids

View Product: Assorted Brands Size Small kids

Assorted Brands

Size Small kids
$7.99 $17

$6.39 20% off with

Quad Seven Size 8
Quad Seven Size 8

View Product: Quad Seven Size 8

Quad Seven

Size 8
$6.99 $10
Gymboree Size 5
Gymboree Size 5

View Product: Gymboree Size 5

Gymboree

Size 5
$9.99 $25

$7.99 20% off with

Score Size X-Small youth
Score Size X-Small youth

View Product: Score Size X-Small youth

Score

Size X-Small youth
$5.99 $10
ZeroXposur Size 8
ZeroXposur Size 8

View Product: ZeroXposur Size 8

ZeroXposur

Size 8
$10.99 $26

$8.79 20% off with

Lands' End Size Small kids
Lands' End Size Small kids

View Product: Lands' End Size Small kids

Lands' End

Size Small kids
$7.99 $17

$6.39 20% off with

Wonder Nation Size 2
Wonder Nation Size 2
New With Tags BadgeNew With Tags

View Product: Wonder Nation Size 2

Wonder Nation

Size 2
$4.99 $7
Nike Size 5
Nike Size 5

View Product: Nike Size 5

Nike

Size 5
$15.99 $36

$12.79 20% off with

Assorted Brands Size X-Large kids
Assorted Brands Size X-Large kids

View Product: Assorted Brands Size X-Large kids

Assorted Brands

Size X-Large kids
$7.99 $20

$6.39 20% off with

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

View Product: Nike Size X-Small youth

Nike

Size X-Small youth
$17.99 $36

$14.39 20% off with

Gap Kids Size 6
Gap Kids Size 6

View Product: Gap Kids Size 6

Gap Kids

Size 6
$10.99 $30

$8.79 20% off with

Old Navy Size Large youth
Old Navy Size Large youth

View Product: Old Navy Size Large youth

Old Navy

Size Large youth
$10.99 $25

$8.79 20% off with

Unbranded Size 10
Unbranded Size 10

View Product: Unbranded Size 10

Unbranded

Size 10
$8.99 $20

$7.19 20% off with

Cat & Jack Size 5T
Cat & Jack Size 5T

View Product: Cat & Jack Size 5T

Cat & Jack

Size 5T
$4.99 $9
Wonder Nation Size 10
Wonder Nation Size 10

View Product: Wonder Nation Size 10

Wonder Nation

Size 10
$6.99 $10
Gymboree Size 5T
Gymboree Size 5T

View Product: Gymboree Size 5T

Gymboree

Size 5T
$9.99 $25

$7.99 20% off with

Art Class Size 10
Art Class Size 10

View Product: Art Class Size 10

Art Class

Size 10
$6.99 $13
Wonder Nation Size 12 mo
Wonder Nation Size 12 mo
New With Tags BadgeNew With Tags

View Product: Wonder Nation Size 12 mo

Wonder Nation

Size 12 mo
$4.99 $7
H&M Size 6
H&M Size 6

View Product: H&M Size 6

H&M

Size 6
$6.99 $15
Lands' End Size Medium youth
Lands' End Size Medium youth

View Product: Lands' End Size Medium youth

Lands' End

Size Medium youth
$7.99 $20

$6.39 20% off with

Assorted Brands Size 10
Assorted Brands Size 10

View Product: Assorted Brands Size 10

Assorted Brands

Size 10
$7.99 $20

$6.39 20% off with

Baby Gap Size 6 mo
Baby Gap Size 6 mo

View Product: Baby Gap Size 6 mo

Baby Gap

Size 6 mo
$9.99 $20

$7.99 20% off with

Lands' End Size Small kids
Lands' End Size Small kids

View Product: Lands' End Size Small kids

Lands' End

Size Small kids
$7.99 $17

$6.39 20% off with

Nautica Size 12
Nautica Size 12

View Product: Nautica Size 12

Nautica

Size 12
$8.99 $20

$7.19 20% off with

Wonder Nation Size 5T
Wonder Nation Size 5T

View Product: Wonder Nation Size 5T

Wonder Nation

Size 5T
$4.99 $9
REI Size Large youth
REI Size Large youth

View Product: REI Size Large youth

REI

Size Large youth
$8.99 $26

$7.19 20% off with

Cat & Jack Size 4
Cat & Jack Size 4

View Product: Cat & Jack Size 4

Cat & Jack

Size 4
$4.99 $9
Nike Size Medium kids
Nike Size Medium kids

View Product: Nike Size Medium kids

Nike

Size Medium kids
$12.99 $36

$10.39 20% off with

ZeroXposur Size 8
ZeroXposur Size 8

View Product: ZeroXposur Size 8

ZeroXposur

Size 8
$10.99 $26

$8.79 20% off with

Hanna Andersson Size 6
Hanna Andersson Size 6

View Product: Hanna Andersson Size 6

Hanna Andersson

Size 6
$12.99 $28

$10.39 20% off with

Old Navy Size 5T
Old Navy Size 5T

View Product: Old Navy Size 5T

Old Navy

Size 5T
$6.99 $15
Zara Size 6
Zara Size 6

View Product: Zara Size 6

Zara

Size 6
$10.99 $26

$8.79 20% off with

Kanu Surf Size Medium youth
Kanu Surf Size Medium youth

View Product: Kanu Surf Size Medium youth

Kanu Surf

Size Medium youth
$8.99 $20

$7.19 20% off with

Unbranded Size 2
Unbranded Size 2

View Product: Unbranded Size 2

Unbranded

Size 2
$7.99 $14

$6.39 20% off with

Gymboree Size 7
Gymboree Size 7

View Product: Gymboree Size 7

Gymboree

Size 7
$9.99 $25

$7.99 20% off with

Nike Size 9
Nike Size 9

View Product: Nike Size 9

Nike

Size 9
$14.99 $36

$11.99 20% off with

H&M Size 6
H&M Size 6

View Product: H&M Size 6

H&M

Size 6
$6.99 $15
Gap Kids Size Small kids
Gap Kids Size Small kids

View Product: Gap Kids Size Small kids

Gap Kids

Size Small kids
$11.99 $30

$9.59 20% off with

...