Best Athletic Girls One Piece Swimwear in 2026

High Quality UPF 50+ Nylon Tricot

Lined front & back

Available in Sizes 2 through 14

MERMAID TAIL: Featuring vibrant and realistic designs that transform you into a Mermaid at the pool or at home, our Mermaiden line showcases 9 beautiful fade-resistant colors!

PREMIUM SWIMSUIT MATERIAL: Tail Skin is resistant to the effects of sun, pool chemicals, and wear with 4-way stretch for fit and comfort (size down if between)

WARRANTY: Lasts 20x longer with a 1-Year Tail Tip Warranty on Reinforced Tips

All Day Comfort & Premium Quality. Our girls swimsuits are made from 87 percent polyester blended with 13 percent spandex. Comfortable bathing suits with quick-dry fabric. It's stretchy, ultra-soft and lightweight, so she can wear it all day long.

Sun Protection & Skin Friendly. These kids swimsuits have UPF 50+ rating, giving your children all day protection from the sun's harmful rays. This girls bathing suit is made from non-transparent fabric that filters up to 99 percent of UV rays.

Adorable and Fashionable Design. Attractive swimsuit for girls feature flowy ruffle overlays along the v-neckline design, with spaghetti neck straps. Give your little Princess a unique and cute look-She will stand out amongst the crowd.

One piece swimwear with front zip design , easy to put on and take off

Feature of TFJH E Girls Swimsuits : 4 way Stretch ,breathable,quick drying and comfortable wear, Recommended hand wash in cold water ,no bleach, hang dry in shade .

Bathing Suits for Girls :Rated UPF 50+ ... Blocking more than 97% of the sun's harmful UV radiation

Next-to-skin without the squeeze

Lightweight, 4-way stretch construction improves mobility & maintains shape

Racer back detail for optimal range of motion fully lined for extra coverage & protection

Quick-dry and elastic material, soft and skin-friendly

UPF 50+ material for UV protection and worry-free sun time, secure all day sun protection for little swimmers

A bright colorful bathing suit for girls, 3D pattern, and beautiful folds detail. A cross-strap design at the back. Dress our cartoon swimsuit or Hawaiian swimsuit for girls, enjoy the summer, enjoy the beach!

84% Polyester, 16% Spandex,Lining: 100% Polyester. High quality profession swimming material and digital print keep the vibrant color steady. Soft and non-itchy fabric is suitable for kid's sensitive skin.

Cute Animal Printed One Piece Swimsuit: Dolphin, Horse, Cat Print. How interesting to wear such a swimsuit to see a dolphin swimming on the sea!

Suitable for kids to go swimming, surfing,attend pool party,etc. Go get her this special gift for summer vacation or birthday surprise~

Endless Fun In The Sun: At Tame the Sun, we know you want to keep your kids safe - so we’ve designed our girls long sleeve swimsuits to be the ultimate sun protection! With its high collar and long sleeves, these high-quality bathing suits for girls are made with lightweight, UPF 50+ fabric, that will protect your child against 98% of harmful UVB and UVA rays.

Perfect Fit For Years: Our long sleeve girls rash guard swimwear are made with durable, soft, and chlorine-resistant fabric, and will stretch comfortably to fit growing bodies. They have a long-lasting, full front and back lining for modesty even when wet. Plus, our girls modest swimwear has a zip guard and chunky zipper. Please refer to size chart below, we recommend sizing down if in doubt.

Adorable, Stylish Swimsuits: Your daughter will love the colorful, fun patterns on this sun-safe children’s swimsuit, and she will be a total standout on family trips to the beach or at the pool! This gorgeous bathing suit with sleeves is a timeless design featuring a modest cut appropriate for girls 3 to 12 years old, and the rear has three super cute ruffles for extra style!

Nike Swim Girls' Essential Racerback One Piece Black SM (7-8 Big Kids) / Black

Quality Materials: We've made this girls swimsuit from quick-drying stretchy fabric that provides UPF 50 protection (the highest possible) for sun safety. Machine wash.

Play All Day: We've added a double layer shelf bra to this girls swimsuit in sizes 12 and up for modesty and support. The tugless fit bottom won't shift or ride up so she can run and play in comfort.

Design Features: Elastic criss-cross straps on this one-piece bathing suit add a pretty touch and it's lined in the front for extra coverage. The high neckline protects her skin from UV rays as well.

STRETCHY MATERIAL:The flattering girls one-piece swimsuit is crafted from soft and stretchy polyester & spandex that offers endless flexibility.It dries quickly for comfort in and out of the water.

FUNKY DESIGN:Our girl bathing suit features Slim straps for ultimate support and comfort. No issues to adjust straps or bottoms, your little fashionista can wear the swim suit alone.

SUN PROTECTION:Opt for TENVDA swimwear with UPF 50+ that works in partnership with sunblock.It block 98% of the sun's UV rays, which can effectively protect girls' delicate skin.

Fabric: 95% Polyester 5% Spandex

Sporty Design: This one piece swimsuit features a popular athletic style in solid colors with a crescent pattern and streamlined racer back straps. Ideal for training, competition, and fitness swimming.

Nice Quality: Double layered material that is breathable, quick drying and chlorine resistant. Over extended use, it will not become baggy or sag.

GIRLS' DESIGNER SWIMWEAR — We love the stretchability of the smocked bodice on this suit from Hobie Girls. Not only does it provide a comfortable fit, it also stays perfectly in place.

FRESH FIT & FEATURES — You get a tailor-made fit that's all about you, with over-the-shoulder straps and full coverage in back for a comfortable fit.

SMOCKING SMARTS — Gently gathered smocking stretches in all the right places while staying in place.

Sun Protection-Front lined ensures modest coverage and sun-protection to protect your girl's delicate skin. Quick dry and lightweight material is comfy for long-wearing.

‘Hollow Out’ Design-Racerback and open keyhole for body bugging fit. Provide more room for girls.

Perfect Support-Wide straps athletic swimsuit is ultimate support and extra comfort, convenience for hot summer, enjoy the sport time.

Fabric is water-repellent and quick-drying; High-quality spandex yarn is selected, which make it high elasticity, suitable for all shapes children and high color fastness.

Technological process: It uses professional four-needle six-thread technology to split and joint. The seam is flat and boneless. It is skin-friendly and comfortable.

Use occasions: Not only suitable for professional swimming training, but also suitable for home swimming pool parties, outdoor beaches

Navy Blue sports athletic one piece swimsuits with racerback, wide shoudler straps and soft wirefree padded bra for great support and shape.

Sporty and sexy design with criss cross straps at the back, underbust elasticated seam. This tummy control one piece swimsuit is easy to put on and save wearing tie-in problems.

Active swimsuit for women, made of high quality soft material. It's excellent elasticity for perfect fit, skin-friendly, breathable, comfortable and soft wearing, easy-to-clean and stain resistant.

Features: kont, hollow out, print, color block, one piece, girls swimwear

Fabric is very stretchy,and it's soft and comfortable

Perfect for beachwear, swimming pool, SPA, solarium, vacation, photographs and other water activities

UPF 50+ protection built in

Made of soft fabric

One piece swimsuit

Block the Burn: UPF 50+ protection blocks up to 98% of the sun’s harmful rays

Superior Chlorine Resistant Creora Highclo Spandex

Pilling Resistant Fabric

Material: 82% Polyester, 18% Elastane; Fabric is stretchy and comfy to wear

Feature: Tie Dye, Criss Cross, Spaghetti Strap, Wireless Bra, One Piece Swimsuit, Removable Padding

Occasion: A Good Choice for Beach, Swimming Pool, Summer, Tropical Vacation

Fabric has high stretch, breathable and comfy

Feature: sleeveless, straps, cross back, full coverage, tie dye, one piece bathing suits for girls

Occasions: suitable for swimwear, beach, swimming pool, vacation and summer party

Premium Fabrics: Girls one-piece swimsuit is lined in front with a high-quality stretch nylon tricot mesh for durable wear and an opaque appearance. Front lined double layered material that is breathable, quick drying and chlorine resistant. Over extended use, it will not become baggy or sag. Girls bathing suit skin-friendly and comfortable for the big girl to wear.

Sporty Design: Girls swimsuit bathing suit features a popular athletic style with racerback straps for full range of motion. Ideal for training, competition, and fitness swimming.

UPF 50+ sun protection: This athletic swimming suit for girls can block more than 98% of the sun's harmful UV radiation. Girls' swimwear takes care of every inch of your girls delicate skin against sand and sun for worry free play all day long.

Great smooth material, 82% nylon and 18% spandex，Lining: 100% Polyester. It's elasticity for perfect fit, quick dry, skin-friendly, breathable, comfortable and soft wearing.

Classical slim Cut One Piece Swimwear with X adjustable straps at back, pretty secure and comfortable. Black and White Striped Heart Deign founce details at chest, making girls more modest and chic.

UPF 50+ sun protection, protece your girls skin from the hot weather

Material---Athletic girls one piece swimsuit is lined with a high-quality stretch nylon tricot mesh, durable wear, and quick drying lightweight material. Front lined double layered material that is breathable, comfy for long-wearing. UPF 50+ sun protective, skin-friendly, suitable for all shapes of girls.

Sporty Design---Competitive swimsuits for girls, infinity splice thick strap, effectively relieve back pressure, exercise more flexible. Swim team swimsuits girls, the back uses a decompression U-shaped strap, the bottom has double-sided stitching design, adding sporty atmosphere.

Size---Girls black swimsuit is suitable for 4-5T, 6-7 Years, 7-8 Years, 9-10 Years old girls, 11-12 Years old girls one piece bathing suit, athletic swimming suit for girls. Please kindly refer to the size chart image on the left for the correct sizing.

Long-lasting color retention

Lycra Xtra Life performance fabric - comfort you expect in quality swimwear made with Lycra

Flat-locked seams lay flatter and closer to the body + won't chafe against skin

Resistant stretch fabric, and a fashion one-piece shape

Complete with fixed straps

【High Quality Fabric】Made of high quality 85% polyester and 15% elastane, girls one piece swimsuits are durable, lightweight, well elastic and quick drying. The girls competition swimsuits are lined with soft and breathable 95% polyester and 5% elastane, cozy and not see-through. The thickness can provide good security protection.

【Professional Sporty Design】The racerback design allows the straps to stay firmly and gently on the shoulder, relieving shoulder and back pressure and making the movement more flexible, so easy to get in and out of. Appropriate tailoring on the butt provides adequate coverage for kids.

【Various Occasions】Bathing suits for girls covers everything and is perfect for her school swim class. The classic strap design makes children's shoulders more flexible and energetic, suitable for swimming team training, family pool party, and outdoor beach.

Maximum comfort, streamlined design lines, maximum range of motion and zero distraction to keep you comfortable lap after lap

The Swim Pro silhouette features thick straps, full front lining, and our most conservative cutout design for a sporty look with maximum back coverage and support

MaxLife fabric is arena’s most advanced and longest-lasting fabric; These suits are designed to deliver maximum comfort, range of motion, and chlorine resistance

💕Size for Girls: 3-4Years old,4-5Years old,5-6Years old,6-8Years old,9-11Years old,11-12Years.old. Please check the size chart for the swimsuit size before you place your order.

💕Sun Protection:Girls one piece long sleeve rashguards protect against rashes, abrasions, and harmful UV rays (UPF 50+), suitable for Surfing, Diving, Swimming, Wakeboarding, Beach activities, Swimming pool, etc

💕Front Zipper Closure: Lengthen cord attached to zipper for easy opening and closure

OFFICIALLY LICENSED BODY GLOVE: Girls' One Piece Bathing Suit; Inspired by all things water, we're dedicated to supporting people's passions in and out of the water with quality athletic apparel

PROTECTIVE SWIMWEAR FOR GIRLS: Skin friendly fabric of this one-piece for girls is perfect for your daughter's delicate skin; Let her enjoy the summer without worrying about sunburn with our high-quality swimsuit; Perfect girls' swimwear for a fun day at the pool or beach

UPF 50+ PROTECTION: Hours of play in the sun without worrying about painful sunburn; This girls' one piece bathing suit offers reliable UV protection for your daughter, so you both can enjoy your day worry-free about sunburn; This girls' bathing suit is a real must-have in your daughter's summer wardrobe