Best Competitive Swimwear Girls One-Piece Suits of 2025

Keira Murphy Avatar
Keira Murphy
Last Updated: 7 Feb 2025

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For young competitive swimmers, having the right swimsuit can make all the difference. Girls one-piece suits are a popular choice for their streamlined design and comfortable fit. These swimsuits are made with high-quality materials that offer excellent durability and resistance to chlorine. They come in a variety of colours and styles to suit different preferences and body types. Designed to reduce drag and maximise speed, these competitive swimwear suits are a great choice for any young swimmer looking to perform their best in the pool.

At a Glance: Our Top Picks

Speedo Junior Girl's ECO Endurance+ Swimsuit Cover #TOP 1
Speedo Junior Girl's ECO Endurance+ Swimsuit
ftb score rating icon 9.8
Speedo Junior Girl's Hyperboom Legsuit for Comfort Cover #TOP 2
Speedo Junior Girl's Hyperboom Legsuit for Comfort
ftb score rating icon 9.7
Speedo Junior Girl's Endurance+ Legsuit Swimsuit Cover #TOP 3
Speedo Junior Girl's Endurance+ Legsuit Swimsuit
ftb score rating icon 9.5

Top 10 Competitive Swimwear Girls One-Piece Suits

#TOP 1

Speedo Junior Girl's ECO Endurance+ Swimsuit

8-13457
True Navy
13-14 Years
Speedo Junior Girl's ECO Endurance+ Swimsuit Cover
Speedo Junior Girl's ECO Endurance+ Medalist Swimsuit | Chlorine Resistance | Recycled Fabric | Comfort Fit | Swimming Lessons | Swim Holiday, True Navy, 13-14 Years

The Speedo ECO Endurance+ Swimsuit is designed with a Medalist cut that enhances your shoulder movement and flexibility, making it perfect for training sessions. Crafted from ECO Endurance+ fabric, it offers excellent durability while providing the comfort you expect. You will appreciate the fit that young swimmers adore, now made from 50% recycled materials to help reduce environmental impact. Additionally, the suit is 100% chlorine-resistant, ensuring it dries quickly and stands up to regular use in the pool.

What We Like
Chlorine-resistant for longevity
Made from recycled materials
Comfortable and flexible fit
Ideal for training sessions
Quick-drying fabric
#TOP 2

Speedo Junior Girl's Hyperboom Legsuit for Comfort

8-00373016
15-16 Years
Speedo Junior Girl's Hyperboom Legsuit for Comfort Cover
Speedo Junior Girl's Hyperboom Splice Legsuit | Chlorine Resistant | Quick Drying | Stretch Fabric | Comfort Fit | 1 Piece, True Navy/Electric Pink/Fandango Pink, 15-16 Years

The Speedo Hyperboom Legsuit is designed for young swimmers who want comfort and freedom of movement during longer swim sessions. Its muscleback design allows for a full range of motion, so you can swim without restrictions. The legsuit provides increased coverage, offering both style and support. With higher chlorine resistance than standard fabrics, it ensures that your swimwear remains looking like new for longer. Additionally, the shape retention feature allows the fabric to stretch, giving you a comfortable fit throughout your swim.

What We Like
Full range of motion
Increased coverage
High chlorine resistance
Shape retention for comfort
#TOP 3

Speedo Junior Girl's Endurance+ Legsuit Swimsuit

8-0031090
Black
13-14 Years
Speedo Junior Girl's Endurance+ Legsuit Swimsuit Cover
Speedo Junior Girl's Endurance+ Legsuit Swimsuit | Chlorine Resistance | Recycled Fabric | Comfort Fit | Swimming Lessons | Swim Holiday, Black, 13-14 Years

The Speedo Endurance+ Legsuit offers excellent features for young swimmers. Its medalist design enhances shoulder movement and flexibility, making it perfect for training sessions. The legsuit provides added coverage, ensuring you feel comfortable while swimming. Additionally, the swimsuit boasts 100% chlorine resistance, ensuring it stands up to regular use and maintains its performance over time. Moreover, its quick-dry fabric means you won't be left waiting long after your swim workout, allowing for a more convenient experience.

What We Like
Chlorine resistant for durability
Quick-drying for convenience
Enhanced shoulder flexibility
Increased coverage for comfort
#TOP 4

Speedo Girl's Hyperboom Medalist Swimsuit, Cobalt Pop

8-00372818
Cobalt Pop
7-8 Years
Speedo Girl's Hyperboom Medalist Swimsuit, Cobalt Pop Cover
Speedo Girl's Hyperboom Allover Medalist Swimsuit, Quick Drying, Fitness, Chlorine Resistant Swimsuit, Cobalt Pop, 7-8

The Speedo Hyperboom Swimsuit is an excellent choice for young swimmers. Its quick-drying fabric ensures you stay comfortable both in and out of the water, making it perfect for training sessions or casual swims. The swimsuit is designed with fitness in mind, providing a snug fit that enhances your performance. Plus, its chlorine-resistant material ensures durability, allowing you to enjoy countless swims without worrying about wear and tear. With its vibrant Cobalt Pop design, you'll also look stylish while you swim.

What We Like
Comfortable fit
Quick-drying fabric
Chlorine resistant
Durable construction
Stylish design
#TOP 5

Arena Girls Powerskin St Next Eco Swimsuit

005877-50-24
Black
Arena Girls Powerskin St Next Eco Swimsuit Cover
Arena Girls Powerskin St Next Ob Jr One Piece Swimsuit, Black, 24 EU

The Arena Powerskin St Next is an innovative racing suit designed specifically for girls, made with recycled fabrics. This eco-friendly suit is not only lighter but also reduces water absorption, helping you swim faster. The unique fabric offers long-lasting compression, enhancing durability throughout your training. With its ergonomic construction and low profile seams, you can enjoy a perfect fit and complete freedom of movement, while the reinforced shoulder straps provide added comfort and support during your performance.

What We Like
Made from recycled materials
Lighter for faster swimming
Excellent fit and movement
Durable with long-lasting compression
Comfortable reinforced shoulder straps
#TOP 6

Arena Solid Challenge Team Girls' Swimsuit

004765
Black-white
Arena Solid Challenge Team Girls' Swimsuit Cover
Arena Girls TEAM SWIMSUIT CHALLENGE SOLID, Black-white, 28 EU

The Arena Solid Challenge Swimsuit is designed for young swimmers who require a reliable and comfortable option for training. Made with MaxLife fabric, it dries quickly and resists chlorine, ensuring longevity even with regular use. With UPF 50+ UV protection, you can feel secure knowing your skin is shielded while swimming outdoors. The one-piece design features an open back and thin straps, providing freedom of movement and reducing friction, allowing you to swim with ease and confidence.

What We Like
Quick-drying fabric
Chlorine resistant
Comfortable fit
Eco-friendly materials
Good UV protection
#TOP 7

Speedo Junior HyperBoom Muscleback Swimsuit

8-00372
5-6 Years
Speedo Junior HyperBoom Muscleback Swimsuit Cover
Speedo Junior Girl's HyperBoom Splice Muscleback Swimsuit | Swim Training |Chlorine Resistant | Quick Drying | Stretch Fabric | Comfort Fit | 1 Piece, True Navy/Electric Pink/Fandango Pink, 5-6 Years

The Speedo HyperBoom Swimsuit is designed for young swimmers aged 5-6 years. Its muscleback design provides a full range of motion, making it ideal for longer swim sessions. With enhanced chlorine resistance, this swimsuit maintains its fit longer, allowing you to enjoy your time in the pool without worry. The shape retention feature ensures that the fabric stretches comfortably, giving you the freedom to swim without feeling restricted. This swimsuit truly combines comfort and durability for the ultimate swimming experience.

What We Like
Great range of motion
Chlorine resistant fabric
Comfortable shape retention
Eco-friendly materials
#TOP 8

Arena Girl's Racing Suit with Recycled Fabrics

005877-401-26
Arena Girl's Racing Suit with Recycled Fabrics Cover
Arena Girl's Racing Suit Powerskin ST Next

The Arena Racing Suit is the first of its kind for girls, crafted from recycled fabrics. This innovative design makes it significantly lighter, ensuring you experience less water absorption and drag while swimming. The suit’s ergonomic construction features low profile seams, offering you a perfect fit and freedom of movement. With reinforced shoulder straps, it guarantees outstanding comfort and durability, allowing you to perform at your best without any distractions.

What We Like
Eco-friendly recycled materials
Lightweight for less drag
Perfect fit and comfort
Increased support and compression
#TOP 9

Arena Girls Powerskin St Next Ob Jr Swimsuit

005877-681-28
Blue
Arena Girls Powerskin St Next Ob Jr Swimsuit Cover
Arena Girls Powerskin St Next Ob Jr One Piece Swimsuit, Blue, 28 EU

The Arena Powerskin One Piece is an innovative racing suit designed specifically for girls. Made from over 60% recycled fabrics, it not only supports sustainability but also offers a lighter feel, reducing water absorption and drag. This means you can swim faster and with greater ease. Its ergonomic design, along with low profile seams, provides an excellent fit and freedom of movement, allowing you to perform at your best. Additionally, reinforced shoulder straps ensure comfort and durability, making it perfect for competitive swimmers.

What We Like
Eco-friendly recycled materials
Lighter for improved speed
Excellent fit and comfort
Enhanced support and compression
#TOP 10

Speedo Kids Navy/Purple One Piece Swimsuit

8-1286414303_13-14
Navy/Purple
13 Years
Speedo Kids Navy/Purple One Piece Swimsuit Cover
Speedo Kids Logo ThinsMB One Piece Swimsuit Navy/Purple 13 Years

The Speedo One Piece Swimsuit is designed for young swimmers, offering a Thinstrap Muscleback for total flexibility while in the water. The higher chlorine resistance ensures the swimsuit maintains its quality over time, allowing you to enjoy a fresh fit for longer. With CREORA HighClo Shape Retention, the fabric stretches comfortably, giving you the freedom to swim without feeling restricted. Additionally, the gusset lining adds an extra layer of comfort during wear, making it an excellent choice for competitive swimming.

What We Like
Flexible Thinstrap Muscleback
High chlorine resistance
Comfortable shape retention
Gusset lining for added comfort
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What are competitive swim suits called?

The style of men's competition swimsuits is called a jammer. With the extreme focus placed on compression technology, you can easily see why. As suit rules have ebbed and flowed over the years, current international specifications dictate a suit for men that can run only from the belly button to the top of the knees.

2. What is a women's one-piece bathing suit called?

The maillot (UK: /mʌɪˈəʊ/; US: /maɪˈoʊ, maɪˈjoʊ/) is the fashion designer's name for a woman's one-piece swimsuit, also called a tank suit. A maillot swimsuit generally consists of a tank-style torso top with high-cut legs.

3. What was the one-piece swimming suit once called?

Kellerman marketed a line of bathing suits and her style of one-piece suits came to be known as "the Annette Kellerman". The one-piece swimming tights became accepted swimsuit attire for women in parts of Europe by 1910. Harper's Bazaar praised the Kellerman swimsuit, writing in June 1920 (vol.

4. Are one piece swimsuits flattering?

Not only are one-piece swimsuits extremely flattering on practically every body type, but they also look super glamorous in poolside selfies.

Editor's Notes

During our competitive swimwear girls one-piece suit research, we found 306 competitive swimwear girls one-piece suit products and shortlisted 10 quality products. We collected and analyzed 21,429 customer reviews through our big data system to write the competitive swimwear girls one-piece suits list. We found that most customers choose competitive swimwear girls one-piece suits with an average price of £17.41.

The competitive swimwear girls one-piece suits are available for purchase. We have researched hundreds of brands and picked the top brands of competitive swimwear girls one-piece suits, including Speedo, Arena.

Written by
Keira Murphy Avatar

Keira Murphy is an outdoorsy girl who loves sports and the outdoors. She's from the UK, but now lives in New York. Keira also has a YouTube channel where she uploads videos of her playing different sports, exploring new places or doing outdoor activities with friends. She started her channel because she wanted to share her love for sports and the outdoors with others who may not be able to get out as much as they would like due to injury, disability or other reasons. Her favorite sport is basketball!