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      • Boys' Clothing (Sizes 4 & Up)
        • Selected categorySwimwear
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        SMLXL456781010-1212Filter Applied1414-161618
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121 results

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    • Size: 12Remove filter
    • PocketsRemove filter
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    • Vans Vanphibian Shorts Boys Size 12 Black Beach Board Surf
      Vans Vanphibian Shorts Boys Size 12 Black Beach Board Surf
      Opens in a new window or tab
      Pre-Owned
      $8.77
      or Best Offer
      +$6.49 delivery
      Free returns
      Sponsored
      Top Rated Plus
    • Abercrombie Kids Boys 11/12 Swim Shorts Blue Donut Motif
      Abercrombie Kids Boys 11/12 Swim Shorts Blue Donut Motif
      Opens in a new window or tab
      Pre-Owned
      $16.49
      or Best Offer
      +$8.57 delivery
      Sponsored
    • BERMIES $42 Blue Pink Green Colorblock Bayside Swim Trunks Boy's Large
      BERMIES $42 Blue Pink Green Colorblock Bayside Swim Trunks Boy's Large
      Opens in a new window or tab
      Pre-Owned
      $11.99
      Was: $14.9920% off
      or Best Offer
      +$4.99 delivery
      Free returns
      Sponsored
    • New! Boy's Under Armour Logo Swim Trunks Size Medium 10/12
      New! Boy's Under Armour Logo Swim Trunks Size Medium 10/12
      Opens in a new window or tab
      Brand New
      $29.95
      or Best Offer
      +$5.95 delivery
      Sponsored
    • Boys Swim Trunks Shorts Little Boys Bathing Suit Swimsuit Toddler Boy Size 10/12
      Boys Swim Trunks Shorts Little Boys Bathing Suit Swimsuit Toddler Boy Size 10/12
      Opens in a new window or tab
      Brand New
      $14.37
      Was: $15.9710% off
      or Best Offer
      Free delivery
      Last one
      Sponsored
    • Patagonia Boys Size 12 Wavefarer Board Shorts Summer Orange Blue Palm Leaves
      Patagonia Boys Size 12 Wavefarer Board Shorts Summer Orange Blue Palm Leaves
      Opens in a new window or tab
      Pre-Owned
      $7.00
      or Best Offer
      +$4.71 delivery
      Free returns
      Sponsored
    • Tom & Teddy 3 Pair Swim Trunks Boys Size 11/12 Mesh Lined Print~ Lobster, Etc
      Tom & Teddy 3 Pair Swim Trunks Boys Size 11/12 Mesh Lined Print~ Lobster, Etc
      Opens in a new window or tab
      Pre-Owned
      $42.00
      or Best Offer
      +$8.71 delivery
      Sponsored
    • Tom & Teddy Sea Turtle Print Swim Trunks Aqua Blue Boy’s Size 11-12
      Tom & Teddy Sea Turtle Print Swim Trunks Aqua Blue Boy’s Size 11-12
      Opens in a new window or tab
      Pre-Owned
      $22.00
      or Best Offer
      +$5.95 delivery
      Sponsored
    • J Crew Crewcuts Blue Patterned Swim Shorts boys size 12 NEW
      J Crew Crewcuts Blue Patterned Swim Shorts boys size 12 NEW
      Opens in a new window or tab
      New (Other)
      $17.49
      Was: $24.9930% off
      or Best Offer
      +$6.55 delivery
      Free returns
      Sponsored
      Top Rated Plus
    • Size 12 Youth Crewcuts by jcrew boys navy blue, blue and green Fish swim trunks
      Size 12 Youth Crewcuts by jcrew boys navy blue, blue and green Fish swim trunks
      Opens in a new window or tab
      Pre-Owned
      $12.95
      or Best Offer
      +$6.55 delivery
      Sponsored
    • Vintage 90s Bugle Boy Neon Colorblock Surf Swim Trunks Bathing Suit Youth 10/12
      Vintage 90s Bugle Boy Neon Colorblock Surf Swim Trunks Bathing Suit Youth 10/12
      Opens in a new window or tab
      Pre-Owned
      $17.99
      or Best Offer
      +$6.80 delivery
      Sponsored
    • Billabong Big Boys Size 26 (L/12) Blue Stripe Pro Recycler Board Shorts Swim NWT
      Billabong Big Boys Size 26 (L/12) Blue Stripe Pro Recycler Board Shorts Swim NWT
      Opens in a new window or tab
      Brand New
      $25.49
      Was: $29.9915% off
      or Best Offer
      +$4.88 delivery in 2-4 days
      Sponsored
    • New! Boy's NIKE Green Logo Swim Trunks Size Medium 10/12
      New! Boy's NIKE Green Logo Swim Trunks Size Medium 10/12
      Opens in a new window or tab
      Brand New
      $29.95
      or Best Offer
      +$5.95 delivery
      Sponsored
    • MICHAEL'S $180 Lot of 3 Cyclist liner Swim Trunks Pineapple Pink Green Boy's 12
      MICHAEL'S $180 Lot of 3 Cyclist liner Swim Trunks Pineapple Pink Green Boy's 12
      Opens in a new window or tab
      Pre-Owned
      $31.99
      Was: $39.9920% off
      or Best Offer
      +$4.99 delivery
      Free returns
      Sponsored
    • Vans Shorts Boys Size 12 Hybrid Black White All Over Print Vanphibian Beach
      Vans Shorts Boys Size 12 Hybrid Black White All Over Print Vanphibian Beach
      Opens in a new window or tab
      Pre-Owned
      $8.97
      Was: $14.9540% off
      or Best Offer
      +$5.95 delivery in 2-4 days
      Free returns
      Extra 20% off with coupon
      Sponsored
      Top Rated Plus
    • Urban Pipeline Swim Shorts Youth Boys Size 12 Husky Flat Front Gray Bermuda
      Urban Pipeline Swim Shorts Youth Boys Size 12 Husky Flat Front Gray Bermuda
      Opens in a new window or tab
      Pre-Owned
      $10.39
      Was: $15.9935% off
      or Best Offer
      +$8.95 delivery
      Free returns
      Sponsored
      Top Rated Plus
    • NEW PATAGONIA BAGGIES 5" SHORTS SWIM TRUNKS BOYS SZ L (12) SUMAC RED LINED  $49
      NEW PATAGONIA BAGGIES 5" SHORTS SWIM TRUNKS BOYS SZ L (12) SUMAC RED LINED $49
      Opens in a new window or tab
      Brand New
      $31.03
      Was: $42.5027% off
      or Best Offer
      +$4.99 delivery
      Sponsored
    • Patagonia Swim Baggies Shorts Kids L (12) Yellow Mesh Lined Trunks Pockets Beach
      Patagonia Swim Baggies Shorts Kids L (12) Yellow Mesh Lined Trunks Pockets Beach
      Opens in a new window or tab
      Brand New
      $22.47
      or Best Offer
      +$6.90 delivery
      Sponsored
    • NWT Boys CREWCUTS Blue & White Pinstriped Seersucker Swim Trunks Bathing Suit 12
      NWT Boys CREWCUTS Blue & White Pinstriped Seersucker Swim Trunks Bathing Suit 12
      Opens in a new window or tab
      Brand New
      $24.50
      or Best Offer
      +$6.55 delivery
      Sponsored
    • Quicksilver Highline Board Shorts 26(12) Dryflight 4 Way Stretch tie dye blue
      Quicksilver Highline Board Shorts 26(12) Dryflight 4 Way Stretch tie dye blue
      Opens in a new window or tab
      Pre-Owned
      $5.99
      or Best Offer
      +$4.99 delivery in 2-4 days
      Free returns
      Sponsored
      Top Rated Plus
    • From our popular brands

      Based on number of views and purchases | Sponsored
        • New! Boy's NIKE Green Logo Swim Trunks Size Medium 10/12
          Nike
          New! Boy's NIKE Green Logo Swim Trunks Size Medium 10/12
          Opens in a new window or tab
          Brand New
          $29.95
          +$5.95 delivery
        • Patagonia Swim Baggies Shorts Kids L (12) Yellow Mesh Lined Trunks Pockets Beach
          Patagonia
          Patagonia Swim Baggies Shorts Kids L (12) Yellow Mesh Lined Trunks Pockets Beach
          Opens in a new window or tab
          Brand New
          $22.47
          +$6.90 delivery
        • Hurley Tie Dye Board Shorts - Boy's Size 12/26
          Hurley
          Hurley Tie Dye Board Shorts - Boy's Size 12/26
          Opens in a new window or tab
          Pre-Owned
          $14.00
          +$5.50 delivery
        • Patagonia Swim Trunks Boys 12 Orange Board Shorts Unlined Hawaiian Floral
          Patagonia
          Patagonia Swim Trunks Boys 12 Orange Board Shorts Unlined Hawaiian Floral
          Opens in a new window or tab
          Pre-Owned
          $13.38
          +$6.95 delivery
          Extra 20% off with coupon
        • New 12 Striped Boys Swim Trunk Shorts Gray Pockets Adjustable Waist by art class
          Art
          New 12 Striped Boys Swim Trunk Shorts Gray Pockets Adjustable Waist by art class
          Opens in a new window or tab
          New (Other)
          $7.95
          +$4.95 delivery
        • Art Class Boardshorts Boys 12 Striped Blue Green Hombre
          Art
          Art Class Boardshorts Boys 12 Striped Blue Green Hombre
          Opens in a new window or tab
          Pre-Owned
          $11.31
          +$8.57 delivery
        • Quiksilver Youth Boys Blue Boardshorts Swim Trunk Drawstring Size 26 NWT
          Quiksilver
          Quiksilver Youth Boys Blue Boardshorts Swim Trunk Drawstring Size 26 NWT
          Opens in a new window or tab
          Brand New
          $27.24
          +$6.00 delivery
        • HURLEY Board Shorts Swim Trunks Mens - Boys Size 12/26 Gray Striped Back Pockets
          Hurley
          HURLEY Board Shorts Swim Trunks Mens - Boys Size 12/26 Gray Striped Back Pockets
          Opens in a new window or tab
          Pre-Owned
          $10.39
          +$4.84 delivery
        • GAP Surf Kids Board Swim Shorts Boy XL (12) Reg Navy & Red Striped Very Nice EUC
          Gap
          GAP Surf Kids Board Swim Shorts Boy XL (12) Reg Navy & Red Striped Very Nice EUC
          Opens in a new window or tab
          Pre-Owned
          $11.99
          +$6.00 delivery
        • Quicksilver Swim Trunks Boys 14 Colorful Board Shorts Swimsuit :::: L
          Quiksilver
          Quicksilver Swim Trunks Boys 14 Colorful Board Shorts Swimsuit :::: L
          Opens in a new window or tab
          Pre-Owned
          $17.10
          Free delivery
        • Disney Store Toy Story Swim Trunks Swimsuit Boys 11/12 Buzz Woody Lined NWT
          Disney
          Disney Store Toy Story Swim Trunks Swimsuit Boys 11/12 Buzz Woody Lined NWT
          Opens in a new window or tab
          Brand New
          $15.00
          +$7.00 delivery
    • NWOT Patagonia Clean Currents Tide-pool Blue Swim Trunks Kids L/12
      NWOT Patagonia Clean Currents Tide-pool Blue Swim Trunks Kids L/12
      Opens in a new window or tab
      New (Other)
      $24.95
      or Best Offer
      +$5.95 delivery in 2-4 days
      Sponsored
    • NWT O'NEILL Gray Striped Swim Trunks Boardshorts Boys/Teens Size 12
      NWT O'NEILL Gray Striped Swim Trunks Boardshorts Boys/Teens Size 12
      Opens in a new window or tab
      Brand New
      $12.99
      or Best Offer
      +$4.84 delivery
      Sponsored
    • Youth Patagonia Board Shorts / Swim Trunks Youth size Large 12
      Youth Patagonia Board Shorts / Swim Trunks Youth size Large 12
      Opens in a new window or tab
      Pre-Owned
      $19.99
      or Best Offer
      +$4.84 delivery
      Sponsored
    • Hurley Boys Swim Trunks Board Shorts Size 12/26 Gray/black Stripes
      Hurley Boys Swim Trunks Board Shorts Size 12/26 Gray/black Stripes
      Opens in a new window or tab
      Pre-Owned
      $9.75
      or Best Offer
      +$4.84 delivery
      Sponsored
    • Bermies Boy’s  Swim Trunks Color Changing Blue To Flamingo Boys Size 12
      Bermies Boy’s Swim Trunks Color Changing Blue To Flamingo Boys Size 12
      Opens in a new window or tab
      Pre-Owned
      $18.00
      or Best Offer
      +$4.84 delivery
      Sponsored
    • EUC Gymboree Boys 12 Flag Stars Stripes Red White Blue Swim Board Shorts Trunks
      EUC Gymboree Boys 12 Flag Stars Stripes Red White Blue Swim Board Shorts Trunks
      Opens in a new window or tab
      Pre-Owned
      $17.99
      or Best Offer
      +$6.55 delivery
      Sponsored
    • The NORTH FACE Swim Trunks Shorts Boys Large (12) Flash Dry Mountain Panorama
      The NORTH FACE Swim Trunks Shorts Boys Large (12) Flash Dry Mountain Panorama
      Opens in a new window or tab
      Brand New
      $18.71
      Was: $24.9525% off
      or Best Offer
      +$5.95 delivery
      Free returns
      Extra 5% off with coupon
      Sponsored
      Top Rated Plus
    • Quicksilver Boys Boardshorts, Swim, Size 12, W26, Good
      Quicksilver Boys Boardshorts, Swim, Size 12, W26, Good
      Opens in a new window or tab
      Pre-Owned
      $15.99
      or Best Offer
      +$8.84 delivery
      Sponsored
    • Art Class Kid's Orange Grey Ombre Swimsuit Size 12
      Art Class Kid's Orange Grey Ombre Swimsuit Size 12
      Opens in a new window or tab
      Pre-Owned
      $16.50
      or Best Offer
      Free delivery
      Free returns
      Sponsored
    • Hurley Tie Dye Board Shorts - Boy's Size 12/26
      Hurley Tie Dye Board Shorts - Boy's Size 12/26
      Opens in a new window or tab
      Pre-Owned
      $14.00
      or Best Offer
      +$5.50 delivery
      Sponsored
    • maui and sons swim trunks Youth 12 Multicolored
      maui and sons swim trunks Youth 12 Multicolored
      Opens in a new window or tab
      Brand New
      $24.88
      or Best Offer
      +$6.20 delivery in 2-4 days
      Free returns
      Extra 22% off with coupon
      Sponsored
      Top Rated Plus
    • Patagonia Swim Trunks Boys 12 Orange Board Shorts Unlined Hawaiian Floral
      Patagonia Swim Trunks Boys 12 Orange Board Shorts Unlined Hawaiian Floral
      Opens in a new window or tab
      Pre-Owned
      $13.38
      Was: $19.9733% off
      or Best Offer
      +$6.95 delivery
      Free returns
      Extra 20% off with coupon
      Sponsored
      Top Rated Plus
    • PATAGONIA Fitz Stripe Swim Trunks Boys 12 Wavefarer Green Striped Board Shorts
      PATAGONIA Fitz Stripe Swim Trunks Boys 12 Wavefarer Green Striped Board Shorts
      Opens in a new window or tab
      Pre-Owned
      $15.99
      or Best Offer
      +$5.50 delivery
      Sponsored
    • MC2 Saint Barth Boys Swim Beach Trunks Shorts Made In Italy Bright Camo 12Y
      MC2 Saint Barth Boys Swim Beach Trunks Shorts Made In Italy Bright Camo 12Y
      Opens in a new window or tab
      Pre-Owned
      $49.00
      or Best Offer
      +$8.10 delivery in 2-4 days
      Sponsored
    • NWT Art Class Target Brand Boys Swim shorts Size 12 Blue
      NWT Art Class Target Brand Boys Swim shorts Size 12 Blue
      Opens in a new window or tab
      Brand New
      $12.97
      or Best Offer
      +$6.97 delivery
      Free returns
      Sponsored
    • Patagonia Kid's Costa Rica Baggies Shorts 3" Unlined Unisex Kids Size L (12)
      Patagonia Kid's Costa Rica Baggies Shorts 3" Unlined Unisex Kids Size L (12)
      Opens in a new window or tab
      Brand New
      $29.97
      or Best Offer
      +$5.75 delivery
      Sponsored
    • Quiksilver Youth Boys Blue Boardshorts Swim Trunk Drawstring Size 26 NWT
      Quiksilver Youth Boys Blue Boardshorts Swim Trunk Drawstring Size 26 NWT
      Opens in a new window or tab
      Brand New
      $27.24
      or Best Offer
      +$6.00 delivery
      Sponsored
    • Tom & Teddy Boys Swim Trunks Size 1-2y
      Tom & Teddy Boys Swim Trunks Size 1-2y
      Opens in a new window or tab
      Pre-Owned
      $28.00
      or Best Offer
      +$8.55 delivery
      Sponsored
    • GANT Boys Dark Blue Regular Fit Swimming Shorts 146 / 152 cm 11 - 12 Years
      GANT Boys Dark Blue Regular Fit Swimming Shorts 146 / 152 cm 11 - 12 Years
      Opens in a new window or tab
      Pre-Owned
      $20.20
      or Best Offer
      +$22.91 delivery
      from Lithuania
      Sponsored
    • New 12 Striped Boys Swim Trunk Shorts Gray Pockets Adjustable Waist by art class
      New 12 Striped Boys Swim Trunk Shorts Gray Pockets Adjustable Waist by art class
      Opens in a new window or tab
      New (Other)
      $7.95
      or Best Offer
      +$4.95 delivery
      Free returns
      Sponsored
      Top Rated Plus
    • GAP Surf Kids Board Swim Shorts Boy XL (12) Reg Navy & Red Striped Very Nice EUC
      GAP Surf Kids Board Swim Shorts Boy XL (12) Reg Navy & Red Striped Very Nice EUC
      Opens in a new window or tab
      Pre-Owned
      $11.99
      or Best Offer
      +$6.00 delivery in 2-4 days
      Free returns
      Sponsored
      Top Rated Plus
    • EUC Gap Kids Boys 12 XL Colorful Shark Fish Swim Board Shorts Trunks Navy Blue
      EUC Gap Kids Boys 12 XL Colorful Shark Fish Swim Board Shorts Trunks Navy Blue
      Opens in a new window or tab
      Pre-Owned
      $17.99
      or Best Offer
      +$6.55 delivery
      Sponsored
    • Hurley Doodle Paradise Boardshorts Boy's SZ: 12/26 Blue Lazer Drawstring Waist~
      Hurley Doodle Paradise Boardshorts Boy's SZ: 12/26 Blue Lazer Drawstring Waist~
      Opens in a new window or tab
      Brand New
      $14.98
      or Best Offer
      +$4.84 delivery
      Sponsored
    • Boy's Art Class Swim Trunks & Shirt UPF 50+ Swimsuit NWT Sz 12
      Boy's Art Class Swim Trunks & Shirt UPF 50+ Swimsuit NWT Sz 12
      Opens in a new window or tab
      Brand New
      $16.95
      or Best Offer
      +$8.19 delivery
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    • Boys Swim Trunks Lot Of 2 Board Shorts Size 12 Black Gray Art Class Tie-dye
      Boys Swim Trunks Lot Of 2 Board Shorts Size 12 Black Gray Art Class Tie-dye
      Opens in a new window or tab
      Pre-Owned
      $9.99
      or Best Offer
      +$6.75 delivery
      Sponsored
    • HURLEY Board Shorts Swim Trunks Mens - Boys Size 12/26 Gray Striped Back Pockets
      HURLEY Board Shorts Swim Trunks Mens - Boys Size 12/26 Gray Striped Back Pockets
      Opens in a new window or tab
      Pre-Owned
      $10.39
      Was: $12.9920% off
      or Best Offer
      +$4.84 delivery
      Sponsored
    • Art Class Boys Swim Shorts Sharks Black Adjustable Size 12
      Art Class Boys Swim Shorts Sharks Black Adjustable Size 12
      Opens in a new window or tab
      Brand New
      $13.50
      Was: $15.0010% off
      or Best Offer
      Free delivery
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    • Boys J. Crew Swimwear 12 Original Sailboats Blue Pockets Mesh Excellent
      Boys J. Crew Swimwear 12 Original Sailboats Blue Pockets Mesh Excellent
      Opens in a new window or tab
      Pre-Owned
      $12.00
      or Best Offer
      +$6.30 delivery
      Sponsored
    • 2 Pair Boy's Swim Trunks Zero Xposure & Gymboree Size Medium 10/12
      2 Pair Boy's Swim Trunks Zero Xposure & Gymboree Size Medium 10/12
      Opens in a new window or tab
      Pre-Owned
      $10.99
      or Best Offer
      +$7.50 delivery
      Sponsored
    • CABANA LIFE Big Boy's 12 Octopus UPF 50 Reversible Swim Trunks NWT
      CABANA LIFE Big Boy's 12 Octopus UPF 50 Reversible Swim Trunks NWT
      Opens in a new window or tab
      Brand New
      $26.99
      or Best Offer
      +$4.84 delivery
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    • Johnnie O Swim Trunks Boys Youth 12 Blue Striped Mesh Lined Pockets
      Johnnie O Swim Trunks Boys Youth 12 Blue Striped Mesh Lined Pockets
      Opens in a new window or tab
      Pre-Owned
      $18.95
      or Best Offer
      +$5.95 delivery
      Sponsored
    • Tom And Teddy Boys 11/12 Lined Swim Trunk Penguin
      Tom And Teddy Boys 11/12 Lined Swim Trunk Penguin
      Opens in a new window or tab
      Pre-Owned
      $7.00
      or Best Offer
      +$8.84 delivery
      Sponsored
    • Kanu Surf Boys Swim Trunks Blue And White Striped Size M 10/12
      Kanu Surf Boys Swim Trunks Blue And White Striped Size M 10/12
      Opens in a new window or tab
      Pre-Owned
      $5.98
      Was: $6.6410% off
      or Best Offer
      +$4.84 delivery
      Sponsored
    • Volcom Boys 26/12 Dusty Payne Mod Boardshorts Surf Swim Zip Pocket Drawstring
      Volcom Boys 26/12 Dusty Payne Mod Boardshorts Surf Swim Zip Pocket Drawstring
      Opens in a new window or tab
      Pre-Owned
      $18.00
      or Best Offer
      +$7.35 delivery
      Free returns
      Sponsored
      Top Rated Plus
    • Hurley Board Shorts Boys Size 12 Black White Neon Stripe Logo Swim Surf Beach
      Hurley Board Shorts Boys Size 12 Black White Neon Stripe Logo Swim Surf Beach
      Opens in a new window or tab
      Pre-Owned
      $18.95
      or Best Offer
      Free delivery
      Free returns
      Sponsored
      Top Rated Plus
    • PATAGONIA Board Shorts Swim Trunks Boys Size 12 Yellow Aqua Navy Wayfarer Pocket
      PATAGONIA Board Shorts Swim Trunks Boys Size 12 Yellow Aqua Navy Wayfarer Pocket
      Opens in a new window or tab
      Pre-Owned
      $18.88
      or Best Offer
      +$6.40 delivery
      Sponsored
    • Johnnie O Swim Trunks Boys Youth 12 Striped Mesh Lined Pockets
      Johnnie O Swim Trunks Boys Youth 12 Striped Mesh Lined Pockets
      Opens in a new window or tab
      Pre-Owned
      $12.95
      or Best Offer
      +$10.55 delivery
      Free returns
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