Best Rainbow Swim Trunks for Boys of 2026

John Zimmer Avatar
John Zimmer
Last Updated: 11 Feb 2026

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.

Introducing the Rainbow Swim Trunks, a vibrant and stylish choice for boys who want to make a splash at the beach or pool. These swim trunks feature a colourful rainbow pattern that is sure to stand out, while providing comfort and functionality. Made from high-quality materials, these swim trunks are designed to withstand hours of swimming and play. Whether your little one is a confident swimmer or just starting out, the Rainbow Swim Trunks are a great choice for any water adventure.

At a Glance: Our Top Picks

MaaMgic Boys' Lightweight Beach Swim Shorts Cover #TOP 1
MaaMgic Boys' Lightweight Beach Swim Shorts
ftb score rating icon 9.9
Boys Rainbow Colored Swim Trunks Cover #TOP 2
Boys Rainbow Colored Swim Trunks
ftb score rating icon 9.8
Boys Rainbow Colored Swim Trunks Cover #TOP 3
Boys Rainbow Colored Swim Trunks
ftb score rating icon 9.6

Top 10 Rainbow Swim Trunks for Boys

#TOP 1

MaaMgic Boys' Lightweight Beach Swim Shorts

HU-XI-201
Stripe Rainbow
10-12 Years
MaaMgic Boys' Lightweight Beach Swim Shorts Cover
MaaMgic Little Boys' Beach Trunk Toddler Swim Shorts Animal Patterned Boardshorts Lightweight Beach Shorts Adjustable Waist Great for All Ages,Stripe Rainbow,10-12 Years

The MaaMgic Beach Swim Shorts are designed with an elastic waistband and drawstring, ensuring a comfortable fit for your little ones. The silky mesh lining adds to the comfort, making it suitable for all-day wear. Crafted from 100% polyester, these shorts are lightweight and quick-drying, perfect for energetic activities. With UPF 50+ sun protection, you can rest assured that your boys are shielded from harmful UV rays while enjoying their time at the beach or pool.

What We Like
Comfortable elastic waistband
Quick-drying lightweight fabric
UPF 50+ sun protection
Fun animal patterns
#TOP 2

Boys Rainbow Colored Swim Trunks

LUCOWEE
Rainbow
7-8 Years
Boys Rainbow Colored Swim Trunks Cover
Boys Rainbow Colored Swim Trunks with Boxer Brief Liner Anti Chafe No Pinching Swimming Shorts Compression Lined 4-Way Stretchy UPF Quick Dry Swimsuit Size 7-8

Features
COMFORTABLE BOXER BRIEF LINER - Super Soft Smooth Material For The Built-In Compression Liner, But Lining Is Not Too Tight,considering Your Kids Need Some Give In The Growing Period.This Swimming Trunks Will Allow Your Boys To Enjoy The Beach,pool Without Chafing Burn,comfortable & Supportive.Also It's Not Only A Bathing Suit,but Also A Nice Piece For Playing,running,training,workout...
RECYCLED 4-WAY STRETCHY FABRIC - Shell: 90% Recycled Polyester, 10% Spandex.Durable Swimming Bottoms,light Weight High-Performance & Water Repellent For Quick-Drying,with Moisture-Wicking Features And A UPF 50+ Finish To Protect Kids From The Sun's Harmful Ultraviolet Rays.
TRUE BOYS REGULAR SIZE - Normal US Size,read The Size Chart Picture Pls.If Your Boy Is Lean Or Average,take Your Waist Size To Buy.Then If He Is Husky Size,please Compare His Waist With Weight,then Choose A Size Which Is Bigger From The Chart.As A Mother Of 2 Boys,I Advice You Take The Bigger Size If Your Kids Are Between 2 Size,boys Grow So Fast In Teenage!
MORE BOUNUS YOU GET - 3 Pocket: Reinforced Deep Side Pockets With Perforated Mesh Lining For Efficient Draining,Secure Back Pocket With Velcro Flap To Hold Valuables Also With Draining Eyelet.Self-Design Unique Patterns And Prints,you'll Have A Pair Of Trunks Destined To Be Ever-Reliable Throughout Your Sun-Soaked Summer.Few Dollars Added,Double Happiness Got! :)
FUNCTIONAL DRAWSTRING & METAL GROMMETS - These Boys' Swimsuits Have Real Drawstring All Around Waist Which Can Be Tighten,kind Elastic Waistband Offers A Great, Personal Fit Even For Slim And Husky Boys,also Help Secure Tightly When Performing Rigorous Activities.Big Boys Sizes 6-8 10-12 14-16 18-20 Is A Must Have Beachwear Essential,including Youth Young Men.
#TOP 3

Boys Rainbow Colored Swim Trunks

LUCOWEE
Rainbow
Boys Rainbow Colored Swim Trunks Cover
Boys Rainbow Colored Swim Trunks with Boxer Brief Liner Anti Chafe No Pinching Swimming Shorts Compression Lined 4-Way Stretchy UPF Quick Dry Swimsuit Size 10-12

Features
COMFORTABLE BOXER BRIEF LINER - Super Soft Smooth Material For The Built-In Compression Liner, But Lining Is Not Too Tight,considering Your Kids Need Some Give In The Growing Period.This Swimming Trunks Will Allow Your Boys To Enjoy The Beach,pool Without Chafing Burn,comfortable & Supportive.Also It's Not Only A Bathing Suit,but Also A Nice Piece For Playing,running,training,workout...
RECYCLED 4-WAY STRETCHY FABRIC - Shell: 90% Recycled Polyester, 10% Spandex.Durable Swimming Bottoms,light Weight High-Performance & Water Repellent For Quick-Drying,with Moisture-Wicking Features And A UPF 50+ Finish To Protect Kids From The Sun's Harmful Ultraviolet Rays.
TRUE BOYS REGULAR SIZE - Normal US Size,read The Size Chart Picture Pls.If Your Boy Is Lean Or Average,take Your Waist Size To Buy.Then If He Is Husky Size,please Compare His Waist With Weight,then Choose A Size Which Is Bigger From The Chart.As A Mother Of 2 Boys,I Advice You Take The Bigger Size If Your Kids Are Between 2 Size,boys Grow So Fast In Teenage!
MORE BOUNUS YOU GET - 3 Pocket: Reinforced Deep Side Pockets With Perforated Mesh Lining For Efficient Draining,Secure Back Pocket With Velcro Flap To Hold Valuables Also With Draining Eyelet.Self-Design Unique Patterns And Prints,you'll Have A Pair Of Trunks Destined To Be Ever-Reliable Throughout Your Sun-Soaked Summer.Few Dollars Added,Double Happiness Got! :)
FUNCTIONAL DRAWSTRING & METAL GROMMETS - These Boys' Swimsuits Have Real Drawstring All Around Waist Which Can Be Tighten,kind Elastic Waistband Offers A Great, Personal Fit Even For Slim And Husky Boys,also Help Secure Tightly When Performing Rigorous Activities.Big Boys Sizes 6-8 10-12 14-16 18-20 Is A Must Have Beachwear Essential,including Youth Young Men.
#TOP 4

Swimming Trunks Boys Children's Swimming Shorts Quick Drying Board Shorts Hawaii Beach Shorts 5-14 Years, Rainbow colours

Rainbow Colours.
9-10 Years
Swimming Trunks Boys Children's Swimming Shorts Quick Drying Board Shorts Hawaii Beach Shorts 5-14 Years, Rainbow colours Cover
Swimming Trunks Boys Children's Swimming Shorts Quick Drying Board Shorts Hawaii Beach Shorts 5-14 Years, Rainbow colours., 9-10 Years

Features
A Must Have For Summer And Holidays: Designed To Make Your Beach Trips Easy, Our Kids Boys Swim Shorts Are Comfortable To Wear And Easy To Care For; Friendly To Your Children And Breathable Makes Them A Must Have In Your Summer Holiday.
Premium Fabric Quality: Our Boys Swimming Trunks Fabrics Are Durable And Soft For Flexible Movements With Their Great Elasticity And Durability. If Your Child Is Taller Or Grows Faster Than Their Age Groups, Buy The Size Larger
Suitable Places: Our Short Swimming Trunks For Children Are Suitable For Sea, Pool, Beach, Parties, School Swimming Lessons, And Also Our Swimming Top Boys Is The Best Gift Choice For Children, Friends And Boys.
RECOMMENDED AND RETURN GUARANTEE: Our Whole Aim Is To Make Your Boys Happy With Our Swimming Trunks. Feel Free To Contact Us For Considerable Customer Service If There Are Any Problems.
DURABLE AND STYLISH - Our Boys Swim Trunks Are Made Of High Quality Fabrics That Extend Their Lifespan. The Colours Of Our Boys Board Shorts Are Bright And Do Not Fade Easily. Different Colours And Styles Make Your Child The Shiniest Star On The Summer Beach.
#TOP 5

Sarfel Boys Swim Trunks with Compression Lining, Kids Swimsuits, Boys Swimsuit, Board Shorts, Teen Boys Quick Dry Shorts, Seaside Rainbow

SAF149FZA057SN
Seaside Rainbow
7 Years
Sarfel Boys Swim Trunks with Compression Lining, Kids Swimsuits, Boys Swimsuit, Board Shorts, Teen Boys Quick Dry Shorts, Seaside Rainbow Cover
Sarfel Boys Swim Trunks with Compression Lining, Kids Swimsuits, Boys Swimsuit, Board Shorts, Teen Boys Quick Dry Shorts, Seaside Rainbow, 7 Years

Features
EXCELLENT ELASTIC COMPRESSION LINING Different From The Ordinary Mesh Lining, Our Boys Swim Trunks Features Compression Lining With Nice Elasticity, Which Can Wrap The Boy's Thighs Well Without Adding Pressure. When You Do Strenuous Exercises, The Board Shorts For Boys Fit Perfectly To The Boy's Muscle Lines And They Do Not Move Up To Make Him Feel Uncomfortable. The Lining Of The Boys Swimsuits Can Not Only Effectively Prevent Friction And Scratches Caused By Sand Or Others, But Avoid Embarrassment And Discomfort.
SUPERIOR BREATHABILITY & QUICK DRYING The Boys Swim Trunks With Compression Lining Is Made Of High Quality Polyester, Which Is Not Only Smooth, Soft And Durable, But Also Has Good Breathability To Stay Cool. The Outer Layer Of The Boys Swimsuit Is Loose To Promote Air Circulation And Will Not Become Stuffy. Quick-Drying Fabric Lets Boys Swim Shorts Dry Quickly Within Minutes. When The Water Evaporates, Heat Is Taken Away. Meanwhile, UPF 50+ Boys Swimwear Can Effectively Prevent The UV Rays.
SUITABLE FOR VARIOUS OCCASIONS The Boys Swim Trunks Are Designed With Bright Colors And Stylish Patterns Such As Colorful Stripes, Pineapple And Coconut Trees. The Kids Hawaiian Style Swim Trunks Are Perfect For Summer To Easily Pair With Printed t-Shirts And Floral Shirts. Vibrant Boys Can Wear The Children's Swimsuits For Boys To Participate In Various Activities. Whether Swimming, Surfing Or Playing Beach Volleyball, The Cool Boys Swimming Trunks Are The Best Choice For The Summer.
SIZE & CLEANING INSTRUCTIONS Our Compression Swim Trunks For Boys Come In 4 Sizes To Fit More Boys. Small Is Recommended For 7 Years, Medium Is Recommended For 8 Years, Large Is Recommended For 10-12 Years Old And XL Is Recommended For 14-16 Years. The Applicable Age Group Is For Reference Only. Please Measure Your Boy's Body Data Carefully Using The Size Chart To Ensure You Buy The Most Suitable One. To Maintain Patterns And Colors For Long Time, We Recommend Hand Washing, Do Not Iron, Do Not Bleach
MULTIPLE POCKETS & FLEXIBLE WAISTBAND The Boys Swimsuits Have Two Side Pockets To Meet Daily Storage Needs, You Can Put Some Things That Are Frequently Used. There Is Also A Pocket On The Lining Of The Boys Swimsuit That Can Safely Store Personal Items Such As Mobile Phone And Cards. In Order To Better Meet The Needs Of Different People, These Teen Swim Trunks Are Characterized By Elastic Waist Ties With Drawstring, Which Can Be Freely Adjusted To Better Fit Your Waist And Avoid Slipping While Providing More Comfort.
#TOP 6

Angel season Boys Swim Trunks UPF 50+ Board Shorts Quick Dry Youth Swimsuit Teen Boys Swimwear Sizes 7-14 Years, Rainbow colours

Angel season
Rainbow Colours
8-9 Years
Angel season Boys Swim Trunks UPF 50+ Board Shorts Quick Dry Youth Swimsuit Teen Boys Swimwear Sizes 7-14 Years, Rainbow colours Cover
Angel season Boys Swim Trunks UPF 50+ Board Shorts Quick Dry Youth Swimsuit Teen Boys Swimwear Sizes 7-14 Years, Rainbow colours, 8-9 Years

Features
Feature The Swim Shorts Have 3 Pockets, 2 Deep Pockets On The Side Of The Pants And A Covered Pocket On The Side Of The Leg For Better Storage Of Valuables. Allow Your Child To Move Freely In The Pool And On The Beach Without Restrictions. Our Boys Swimwear Or Swim Trunks All Have An Excellent Quick Drying Feature That Only Takes About 5 To 10 Minutes For The Swim Trunks To Dry. They Are Also Fade Resistant, Making Them Both Durable And Comfortable While Preventing Rashes.
Durable Materials The Fabric Of Boys Swim Trunks Is Made Of 100% Durable Polyester, Swim Trunks Lining Made Of 100% Polyester Mesh. These Boys Swim Shorts Are Very Soft To The Touch And Fit Perfectly. The Boys Swimsuits Are Chlorine Resistant And The Board Shorts Retain Color Without Worrying About Color Loss. Make These Beach Swim Shorts Great For Swimming. These Boys Swimming Trunks Are Equipped With Elastic Waistband And Adjustable Drawstring, Which Can Be Freely Adjusted For All Kinds Of Sports.
SUN PROTECTION The Fabric Of These Swim Trunks Is Rated Up To UPF 50+, Provides Maximum UV Protection, Blocks 98% Of Harmful UVA And UVB Sun Rays, And Protects Your Child's Skin Even When The Swim Trunks Are Wet. These Boys Swim Trunks Are Designed For Boys, With The Cutest Colors And Patterns That Reference Boys' Favorite Swim Trunks. We Have Pineapple, Rainbow, Shells, Shark, Bird And Palm Leaf Patterns. The Loose Fit Of The Swim Trunks Makes Your Boy Stand Out On The Beach.
PERFECT FIT Our Boys Swim Trunks With Compression Lining Comes In Five Sizes To Fit 7 Swim Trunks, 8 Swim Trunks, 9-10 Swim Trunks, 11-12 Swim Trunks To 13-14 Swim Trunks, But The Age Is For Reference Only. You Can Choose The Size According To Your Child's Actual Body Type. If Your Child Is Overweight, You Can Choose One Size Larger. These Boys Swimming Trunks Allow Your Kids To Enjoy Their Time At The Beach, Vacations, Water Parks And Weekends. This Swimsuit Is A Perfect Gift For Your Boy.
OCCASION We Are Committed To Designing Boys Swim Trunks That Are Both Comfortable And Durable For Kids To Enjoy Their Time In Beach Vacation, Swimming Lessons, Pool Parties, Water Parks, Surfing, Rafting, Fishing, Relaxing And Other Water Activities. It Can Also Be A Birthday, Halloween, Christmas Gift For Your Children.
#TOP 7

XiaoMoSha Boys Swimming Trunks Toddler Swim Beach Board Shorts

XiaoMoSha
Rainbow Tree
4-6 Years
XiaoMoSha Boys Swimming Trunks Toddler Swim Beach Board Shorts Cover
XiaoMoSha Boys Swimming Trunks Toddler Swim Beach Board Shorts for Boys Swimsuit,RainbowTree,4-6 Years

Features
[Elasticated Waistband] Drawstring Design, Easy To Put On And Take Off. The Boys Swimming Trunks With Elasticated Waistband, More Stable, Not Easy To Fall Off. The Compression Liner Swim Shorts Protects The Skin Have A Silky Smooth Stretch, No Need To Worry About The Problem Of Chafing And Sand.
[High-Quality Fabric] The Boys Swim Trunks Are Made Of 95% Polyester And 5% Spandex Material. Lightweight And Durable, Soft And Breathable Material , Comfortable To Wear. Keep Your Kids Happy All Day Long In These Trendy And Stylish Swim Trunks!
[Unique Design] Various Hawaiian Style Designs, Such As Different Styles Of The Coconut Tree Swim Trunks, Flamingo Swim Trunks And Etc. Beautiful And Fashionable Patterns And Styles Are Very Attention-Getting, Which Make Kids Stand Out From The Crowd!
[Size Chart] You Can Choose Swim Shorts For Your Boys According To The Detailed Information And Suggestions On The Size Chart. If The Child Is Taller Or Growing Faster, Choose The Size Up!
[Occasions] Suitable For Walking, Running, Swimming, Surfing, Playing, Rafting, Swim Training, Water Park, Beach Or Resting At Home. Choice For Holiday, Also Perfect For Gifts For Your Children, Grandsons Or Friends' Child.

PAEHUIMT Boys Swim Shorts with Adjustable Waist

PAEHUIMT
Blue
8-9 Years
PAEHUIMT Boys Swim Shorts with Adjustable Waist Cover
PAEHUIMT Boys Swimming Trunks - Swim Shorts for Kids 3-12 Years, Ages 8-9, Regular, Blue

The PAEHUIMT Boys Swim Shorts offer neat and tight seams, ensuring durability and long-lasting wear, so you don’t have to worry about them falling apart easily. The soft, breathable mesh lining protects privacy and keeps you comfortable while swimming. Made from quick-drying polyester fiber and spandex, these shorts are soft and stretchy, providing ease of movement in and out of the water. Ideal for water parks, pools, beaches, and hot springs, these swim shorts are versatile for many water activities.

What We Like
Durable, neat stitching
Soft, breathable mesh lining
Quick-drying, elastic fabric
Suitable for various water activities
#TOP 9

Showudesigns Rainbow Tie Dye Boys Swim Trunks Colorful Hippie Swimming Trunks 13-14 Years Swimwear Graphic Beach Boardshorts Gift

ZZ-L5476Z55-97
Tie Dye
13-14 Years
Showudesigns Rainbow Tie Dye Boys Swim Trunks Colorful Hippie Swimming Trunks 13-14 Years Swimwear Graphic Beach Boardshorts Gift Cover
Showudesigns Rainbow Tie Dye Boys Swim Trunks Colorful Hippie Swimming Trunks 13-14 Years Swimwear Graphic Beach Boardshorts Gift for Boys Son Nephew

Features
Features: This Boy Boardshorts Is Suitable For Swimming, Training, Basketball, Sports, Fitness, Surfing, Playing, Rafting, Resting On The Beach Or At Home
Material: Made Of High Quality Polyester And Spendax, Quick Dry, Lightweight, Stretchy, Soft And Breathable
NOTICE: Some Buyers Report That The Size Of This Swimming Trunks Is A Little Bit Small. Please Check Our Size Chart Before Buying!
Designs: Printed With Shark, American Flag, Animals, Camouflage, Wolf, Leopard, Cow, Cats, Dinosaur Dragon, Tropical Palm Trees, Fish, Flower, Galaxy, Hawaiian, Pineapple, Rainbow Tie Dye Etc
Best For Gifts: The Perfect Gift To Share With Your Families Or Friends Who Has Kids On Birthdays, Children's Day, Summer Holiday, Halloween, Easter Day, Thanksgiving Day, And Christmas Day Etc
#TOP 10

Harry Bear Boys Gaming Swim Shorts for Kids

Black
7-8 Years
Harry Bear Boys Gaming Swim Shorts for Kids Cover
Harry Bear Boys Gaming Swimming Shorts Gamer Swim Trunks for Kids Black 7-8 Years

The Harry Bear Gaming Swim Shorts are designed for fun in the sun. With a premium quality construction, these swim trunks provide comfort and style, making them ideal for active days at the pool or beach. The vibrant video game motif adds a playful touch, sure to delight young gamers. The tie waist detail ensures a secure fit, allowing you to enjoy swimming without worries. Plus, the embroidered Harry Bear logo adds a charming finish to these stylish swim shorts.

What We Like
High-quality fabric
Comfortable and lined
Fun video game design
Secure fit with tie waist
Stylish embroidered logo
Buying Guide Image
Editor's Notes

During our rainbow swim trunk for boys research, we found 164 rainbow swim trunk for boys products and shortlisted 10 quality products. We collected and analyzed 16,055 customer reviews through our big data system to write the rainbow swim trunks for boys list. We found that most customers choose rainbow swim trunks for boys with an average price of £20.00.

The rainbow swim trunks for boys are available for purchase. We have researched hundreds of brands and picked the top brands of rainbow swim trunks for boys, including MaaMgic, LUCOWEE, Aisyee, Sarfel, Angel season.

Written by
John Zimmer Avatar

John Zimmer is a truly professional writer on findthisbest.com. He has specialized in writing content a wide variety of fields for over a decade. Since 2011, he has been using his expertise and extensive experience to write content for online shopping guide websites. In addition to writing for findthisbest.com, he has appeared in publications such as The Spruce, Wirecutter and Bestbuy.