1,100+ results
- Mario Kart Mario & Luigi Swim Trunks Boy's XS (4 - 5)Opens in a new window or tabPre-Owned$11.00or Best Offer+$4.33 delivery
- Hurley Board Shorts Boys Size XS 21x6 Floral Print BlackOpens in a new window or tabPre-Owned$20.00or Best OfferFree deliveryFree returns
- Cat & Jack Swim Trunks Boys Size XS 4-5 Stripe Lined BlueOpens in a new window or tabPre-Owned$3.76Was: $5.7935% offor Best Offer+$5.85 deliveryFree returnsTop Rated Plus
- Gap Kids Boys Size XSmall 4/5 Mesh Lined Blue Brown Floral Swim Trunks ShortsOpens in a new window or tabPre-Owned$8.99Was: $9.9910% offor Best Offer+$7.99 delivery in 2-4 daysFree returnsExtra 15% off with couponTop Rated Plus
- Vintage Size Boys Flarico Swim Athletic Supporter Boys Size X-Small From 1970sOpens in a new window or tabBrand New$19.95Buy It Now+$4.95 delivery
- Vintage Size Boys Flarico Swim Athletic Supporter Boys Size X-Small From 1970sOpens in a new window or tabBrand New$18.95Buy It Now+$4.95 delivery
- Member's Mark 2-Piece Family Swim Boy's Rashguard & Swim Trunk SetOpens in a new window or tabBrand New$12.99List price: $24.0046% offBuy It NowFree deliveryFree returnsSave up to 30% when you buy moreTop Rated Plus
- Member's Mark Boy's 4-Way Stretch Quick Dry Resort Swim TrunkOpens in a new window or tabBrand New$10.99List price: $30.0063% offBuy It NowFree deliveryFree returnsSave up to 30% when you buy moreTop Rated Plus
Picked For You
Top selling items from trusted sellers | Sponsored- Member's Mark Boy's 4-Way Stretch Quick Dry Resort Swim TrunkOpens in a new window or tab$10.99ewirelessgear (169,238) 99.7%Save up to 30% when you buy more
- Speedo Boys 2pk Swim Tee Short Sleeve new with tagsOpens in a new window or tab$15.30thebestforless75 (4,894) 100%
- Cat & Jack Boys 3 Color Tiered Swim Trunks Swimsuit UPF 50+ Size XL 16 HuskyOpens in a new window or tab$10.11bargainfields (1,903) 100%Save up to 20% when you buy more
- Adidas Supernova Recreational Swim Shorts Boys X-Small Ocean Blue, Deep BlueOpens in a new window or tab$29.99ezshipshp (1,379) 98.3%
- Sonic The Hedgehog Swimsuit XS Boys NewOpens in a new window or tab$12.60forgottenape (37,931) 99.7%
- All In Motion Boys' XS 4/5 Blue & Teal Tropical Geo Print Hybrid Board ShortsOpens in a new window or tab$13.45theluckyfin1 (36,762) 99.6%Save up to 20% when you buy more
- Cherokee Boy's Swim Trunks Blue Skulls Size XSOpens in a new window or tab$14.25mjaybell24 (9,349) 99.2%
- Patagonia Swim Suit Boys XS Youth 24" waist 5" inseam Elastic NAVY BLUE ShortsOpens in a new window or tabPre-Owned$12.95or Best Offer+$6.57 delivery
- Member's Mark Boys 4Way Stretch Quick Dry UPF50 Sun Protection Resort Swim TrunkOpens in a new window or tabBrand New$11.99List price: $30.0060% offBuy It NowFree deliveryFree returnsSave up to 30% when you buy moreTop Rated Plus
- Swim Trunks NEW WITH TAGS Boys Size 4/5 (XS) by Cat & Jack, Tie Dye, UPF 50+Opens in a new window or tabBrand New$10.50or Best Offer+$5.62 delivery
- Cat & Jack Boys 3 Color Tiered Swim Trunks Swimsuit UPF 50+ Size XL 16 HuskyOpens in a new window or tabBrand New$10.11Was: $10.998% offBuy It NowFree deliverySave up to 20% when you buy more
- Lilly Pulitzer Boys Size Toddler 3-4 Junior Capri Swim Trunks Bathing SuitOpens in a new window or tabPre-Owned$19.95Buy It NowFree delivery
- Lands End Printed Volley Shark Swim Trunks Boys' Size XS Blue & Black NWOT!Opens in a new window or tabNew (Other)$17.99Was: $19.9910% offBuy It Now+$6.50 delivery
- Minecraft swim trunk and rashguardOpens in a new window or tabPre-Owned$8.00or Best Offer+$4.84 delivery
- TYR Boys' Durafast ONE Jammer Swimsuit, Black, 26 XSOpens in a new window or tabNew (Other)$27.91Was: $34.8920% offBuy It NowFree deliveryFree returnsTop Rated Plus
- Chubbies Kids Swimming Trunks 4T-5TOpens in a new window or tabPre-Owned$20.00or Best Offer+$4.71 delivery
- Patagonia Boys XS Extra Small Orange Swim Trunks Bottoms Shorts SolidOpens in a new window or tabPre-Owned$17.00Buy It NowFree delivery
- Disney Cars Boys Swim Trunks Lightning McQueen Swim Shorts Pixar Size XS 4/5 NWTOpens in a new window or tabBrand New$19.99or Best Offer+$6.20 delivery
- Boys Columbia Swim Trunks Tropical XS 6/7Opens in a new window or tabPre-Owned$0.991 bid · Time left22h 14m+$5.00 delivery
From our popular brands
Based on number of views and purchases | Sponsored- HurleyHurley Board Shorts Boys Size XS 21x6 Floral Print BlackOpens in a new window or tabPre-Owned$20.00Free delivery
- GapGap Kids Boys Size XSmall 4/5 Mesh Lined Blue Brown Floral Swim Trunks ShortsOpens in a new window or tabPre-Owned$8.99+$7.99 deliveryExtra 15% off with coupon
- NikeNike Swim Trunks Boys XS *estimated* Light Blue Brief LinedOpens in a new window or tabPre-Owned$12.00+$4.99 delivery
- CrewcutsJ.Crew CrewCuts Boys Kids Long Sleeve Colorblock Rash Guard White Blue XSOpens in a new window or tabBrand New$19.99+$6.30 delivery
- HurleyHURLEY Character Check Pull-On Swim Trunks 28 in W Boys L Mens XSOpens in a new window or tabBrand New$12.99+$6.40 delivery
- PatagoniaPatagonia Baggies Board Shorts Yellow Green Leaf Print XSOpens in a new window or tabPre-Owned$17.99+$6.55 delivery
- ArtArt Class Toddlers Salmon Drawstring Lined Swim Trucks Size XS 4-5Opens in a new window or tabPre-Owned$5.00+$5.00 delivery
- SpeedoSpeedo Boys 2pk Swim Tee Short Sleeve new with tagsOpens in a new window or tabNew (Other)$15.30Free delivery
- DisneyCars 3 ~ Disney/Pixar Characters Little Boys Swim Shorts Size XS 4/5Opens in a new window or tabPre-Owned$12.95+$4.00 delivery
- PatagoniaPatagonia $49 Kids Baggies Nylon Shorts 7" Lined Afternoon Pink Size XS (5-6)Opens in a new window or tabBrand New$44.00+$5.89 deliveryExtra 23% off
- ArtArt Class 3Pc MultiColor Rash-guard Swimsuit Size XS (4/5)Opens in a new window or tabBrand New$12.00+$4.84 delivery
- Cat and Jack Boys Swim Trunks Pink XS 4/5Opens in a new window or tabBrand New$17.86Was: $19.8510% offor Best OfferFree deliveryFree returnsTop Rated Plus
- Nike Swoosh Swim Shorts Trunks NESSB-451-001 Black / Gray Size XS NWTOpens in a new window or tabBrand New$25.00or Best Offer+$6.40 delivery
- Member's Mark Boys Resort Built-In Liner Swim Trunk (Light Blue, XS (4/5))Opens in a new window or tabBrand New$12.99List price: $30.0057% offBuy It NowFree deliveryFree returnsTop Rated Plus
- Art Class Boys' Solid Swim Trunks Black NWTOpens in a new window or tabBrand New$9.99Buy It Now+$4.84 delivery
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- Chubbies NEW NWT Youth XS Classic Lined Swim Trunks True BluesOpens in a new window or tabNew (Other)$30.00or Best Offer+$4.84 delivery
- BRAND NEW BOYS SIZE X-SMALL 4-5 WONDER NATION 4 WAY STRETCH SWIM TRUNKSOpens in a new window or tabBrand New$7.99Buy It NowFree delivery
- Abercrombie & Fitch Board Shorts Youth Boys Extra Small Striped Black BeachOpens in a new window or tabPre-Owned$16.80Was: $19.7715% offor Best Offer+$7.45 deliveryFree returns
- REI Co-op Yellow Swim Shorts size X-Small (6-7)Opens in a new window or tabPre-Owned$18.00Buy It Now+$4.52 delivery
- Old Navy Rainbow Striped Swim Trunks Boy Size XSOpens in a new window or tabPre-Owned$19.99or Best Offer+$8.99 delivery
- Vintage Pro Spirit Kids Swim Trunks 90s Style Size XS 4-5Opens in a new window or tabPre-Owned$14.00or Best Offer+$4.84 delivery
- Volcom Lido Print Mod Boardshorts Boys' 29 (XL) Mens (XS) CleanwaterOpens in a new window or tabBrand New$15.99Buy It Now+$6.40 delivery
- Lilly Pulitzer Boys Capri Swim Trunks Pink Blue White Lavender Size XSOpens in a new window or tabPre-Owned$22.99or Best Offer+$5.99 delivery
- Cat & Jack Boys 3 Color Tiered Swim Trunks Swimsuit Size XL 16 HuskyOpens in a new window or tabBrand New$6.99Buy It Now+$4.29 deliveryFree returnsSave up to 20% when you buy moreTop Rated Plus
- Billabong toddler swim surf trunks Bathing Suit Size 2TOpens in a new window or tabNew (Other)$20.00or Best Offer+$5.00 delivery
- Southern Tide Boys Small 4-5 XS Coral Orange Elastic Waist Swim Trunk ShortsOpens in a new window or tabBrand New$18.00or Best Offer+$7.95 delivery
- Rokka&Rolla Boy‘s Compression Liner Swim Trunks Quick Dry Bathing SuitOpens in a new window or tabBrand New$29.99Was: $42.8430% offBuy It NowFree delivery in 2-4 daysFree returnsTop Rated Plus
- Rokka&Rolla Boys Swim Trunk Mesh Lined Bathing Suit UPF50+Quick Dry Beach ShortsOpens in a new window or tabBrand New$25.50Was: $36.4330% offBuy It NowFree delivery in 2-4 daysFree returnsTop Rated Plus
- Member's Mark Boy's 4-Way Stretch Quick Dry Resort Swim Trunk Shark Galore XSOpens in a new window or tabBrand New$10.79Was: $11.9910% offBuy It NowFree delivery
- Lilly Pulitzer Toddler Boys Swim Shorts New XSOpens in a new window or tabBrand New$40.00or Best Offer+$4.84 delivery
- Boys' Ombre Zebra Striped Swim Shorts - art classâ„¢ Blue NWTOpens in a new window or tabBrand New$9.99Buy It Now+$4.84 delivery
- Boys' Solid Swim Trunks - art class Light Blue XS 4/5Opens in a new window or tabBrand New$8.50Was: $10.0015% offor Best Offer+$3.89 deliveryFree returnsTop Rated Plus
- NWT Lands’ End Boys Swim Trunks Swim Bottoms Size X-Small (4-5) Quick Dry NWTOpens in a new window or tabBrand New$15.00Buy It Now+$6.59 delivery
- Star Wars The Mandalorian Boys' Baby Yoda Swim Short Size XS(4-5)/ NewOpens in a new window or tabBrand New$7.00Was: $10.0030% offBuy It Now+$5.24 deliveryExtra 10% off with coupon
- NWT *GAP* Boys SS Swim Rashguard Navy Blue Waves *size XS 4-5*Opens in a new window or tabBrand New$10.99Buy It Now+$4.51 delivery
- Osprey Wetsuit OSX Series Youth XS Full Length Long Sleeve Size Junior BlackOpens in a new window or tabPre-Owned$28.00or Best Offer+$9.00 delivery
- NWT Disney Store STAR WARS ADAPTIVE STORMTROOPER SWIMSUIT Boys XS BLACK WHITEOpens in a new window or tabBrand New$21.99or Best Offer+$4.84 delivery
- Cat & Jack XS/S White Cover Up Sweatshirt Long Sleeve Hoodie Swim Terry ClothOpens in a new window or tabBrand New$9.81or Best OfferFree deliverySave up to 25% when you buy more
- Sz 4-16 Boys Baby Yoda Swim Trunks Shorts Swimsuit Star Wars Mandalorian GroguOpens in a new window or tabBrand New$24.50 to $26.50Buy It Now+$4.95 delivery
- Brand NEW Spider-Man Boys Rash Guard with Short Sleeves Size XS/XCH 4/5Opens in a new window or tabBrand New$5.000 bids · Time left4d 8h+$3.43 delivery
- Nike Swim Jammer Shorts Boys Youth Techno Camo Swimwear Bottoms TESS0041Opens in a new window or tabBrand New$19.99Buy It NowFree deliveryFree returnsTop Rated Plus
- Hurley Boys' Rash Guard Shirt Black/Printed 4 XSOpens in a new window or tabBrand New$12.00Buy It NowFree delivery
- BOYS JOE BOXER SWIM TRUNKS BOARD SHORTS BLACK & Green XS 4-5Opens in a new window or tabPre-Owned$1.000 bids · Time left5d 21h+$4.84 delivery
- Lands’ End Boys Size XS (4-5) Tropical Swim TrunksOpens in a new window or tabPre-Owned$3.000 bids · Time left5h 32m$5.00Buy It Now+$4.51 delivery
- Lilly Pulitzer boys swim trunks XS in celestial seas starfish printOpens in a new window or tabPre-Owned$33.77Buy It Now+$4.84 delivery
- Sz 4-12 Boys Baby Yoda Swim Trunks Shorts Swimsuit Star Wars Mandalorian GroguOpens in a new window or tabBrand New$25.29Was: $26.906% offBuy It Now+$4.95 delivery
- Gap Boys Swim Outfit Shirt Rashguard & Swim Trunks Shorts Blue Size XS 4/5 EUCOpens in a new window or tabPre-Owned$19.00Buy It Now+$6.00 delivery
- Scooby Doo Swim Goggles Blue and Yellow 2010 Warner Brothers ShatterproofOpens in a new window or tabBrand New$2.000 bids · Time left1d 19hor Best Offer+$7.85 deliveryFree returns
- Sonic The Hedgehog Swim Trunks Boys Size XS 4/5Opens in a new window or tabPre-Owned$5.59Was: $6.9920% offor Best Offer+$4.84 delivery
- 2x STAR WARS Boy's XS 4/5 Blue Swim Suits/Trunks/Board Shorts Yoda Grogu VaderOpens in a new window or tabPre-Owned$5.00or Best Offer+$8.95 delivery in 2-4 days
- Boys Swim Old Navy XS (5)Opens in a new window or tabPre-Owned$5.000 bids · Time left3d 22h+$4.84 delivery
- Adidas X Disney Youth Boys Buzz Lightyear Long Sleeve Rash GuardOpens in a new window or tabBrand New$24.00Buy It NowFree delivery
- Tylers Youth XSmall Classic Swim Trunks Dinosaur Surfer SummerOpens in a new window or tabPre-Owned$19.60or Best Offer+$7.25 delivery
- NEW Speedo Swim Trunks blue boys sz XS 6/7 sunblocking, water repellantOpens in a new window or tabBrand New$9.95Buy It Now+$5.00 deliverySave up to 20% when you buy more
- The Child Boys Baby Yoda Swim Trunks Swimsuit Star Wars Mandalorian Size XSOpens in a new window or tabPre-Owned$6.00or Best Offer+$5.31 delivery
- Star Wars Boys Vintage Style Black Blue Short Sleeve Swim Shirt UPF 50+, Size XSOpens in a new window or tabBrand New$9.95or Best Offer+$5.99 delivery in 2-4 daysFree returns
- Lilly Pulitzer Boy's Blue Swim Trunks Shorts Size XSOpens in a new window or tabPre-Owned$15.99Buy It Now+$4.49 delivery
- NEW Kid Boy XS SpongeBob Squarepants Swim Trunks Swimsuit Board Shorts LinedOpens in a new window or tabBrand New$14.95or Best Offer+$5.95 deliveryLast one
- Speedo swim trunks boys Shark Blue Yellow XSOpens in a new window or tabPre-Owned$5.60or Best Offer+$4.33 delivery
- Vilebrequin Boys Blue Swim Trunks Sz XSOpens in a new window or tabPre-Owned$40.00or Best Offer+$4.84 delivery
- Ocean Gear Orange Rashguard and Swim Trunks Boys Size XSmallOpens in a new window or tabPre-Owned$4.99or Best Offer+$4.84 delivery
- FINA APPROVED YINGFA 9205 MEN'S BOY'S COMPETITION JAMMER SWIMMING TRUNK ALL SIZEOpens in a new window or tabBrand New$29.99Buy It NowFree deliveryfrom China
- Nike Swim Trunks Boys XS *estimated* Light Blue Brief LinedOpens in a new window or tabPre-Owned$12.00Buy It Now+$4.99 deliveryFree returnsTop Rated Plus
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