Best Swimwear for Kids in Japan: Top Picks for Summer 2025

Finding the perfect swimwear for kids can be a challenge—especially with Japan’s wide variety of adorable, functional, and sun-safe options. Whether you’re planning beach days, poolside fun, or swimming classes, it’s essential to choose swimwear that’s not only stylish but also provides the right comfort and protection for your little ones. In this guide, we’ve handpicked some of the best swimwear for kids available in Japan in 2025 — from UV-protective rash guards to easy-dry one-pieces and playful prints that kids love. Dive in and discover the top choices that keep kids safe, comfortable, and full of confidence in the water.

If you are in a rush, you can buy the best item based on your budget, color and material preference, and our commendation given below. Based on our study, we concluded that-
– The Overall Best – Yolrky Baby Swimwear
– Best for Sun Protection – Lucky Kids Swimsuit
– The Editorial Choice – Solcy Kids Swimsuit

Best Swimwear for Kids in Japan

1. Emfay Kids Swimsuit
2. GoUseGo Kids Swimsuit
3. Yolrky Baby Swimwear
4. Lucky Kids Swimsuit
5. Regalo Baby Swimsuit
6. Solcy Kids Swimsuit

Here are the details of each swimwear for kids on the above list-

1. Emfay Kids Swimsuit

Brand	Emfay
Material composition	100% Polyester
Care instructions	Hand Wash Only
Color	Navy
Closure type	Buckle
Top style	Rashguard
Availed sizes	90 cm to 150 cm

Perfect for active little swimmers, the Emfay Kids Swimsuit is a practical and fun 3-piece set that includes a long-sleeve rash guard, matching swim pants, and a protective swim cap. Designed with a playful shark pattern, this set brings excitement to pool or beach time while keeping your child protected from the sun. Made from 100% polyester, the fabric is soft, stretchy, and gentle on delicate skin — ensuring comfort as kids move, play, and swim.

The sturdy elastic construction and secure buckle closure make it a reliable choice for energetic boys. Available in sizes from 100 to 150 cm, it offers a snug yet flexible fit for various age groups. Whether it’s a day at the beach or swim class, this Emfay swimsuit set balances safety, style, and performance — making it a great choice for parents seeking both function and fun.

2. GoUseGo Kids Swimsuit

Brand	GoUseGo
Material composition	Polyester, polyurethane
Care instructions	Hand Wash Only
Color	Green tree, Gray stripe, Surfing, Shell, Ducks
Closure type	String
Top style	Rashguard
Availed sizes	80 cm to 130 cm

The GoUseGo Kids Swimsuit is a stylish and protective 3-piece set featuring a rash guard top, surf-style swim pants, and a matching cap — perfect for boys and girls from 80 to 130 cm tall. Designed for UV-heavy days at the beach or pool, the fabric offers UPF 50+ protection, blocking over 90% of harmful rays while keeping kids cool and comfortable. The playful prints, including elephants, ducks, and shells, add a fun, cheerful touch.

Made from a recycled polyester and polyurethane blend, this swimsuit is durable, quick-drying, and gentle on sensitive skin. With 3/4-length sleeves and excellent stretch, it supports easy movement without restricting play. Whether for school swimming lessons, outdoor adventures, or family beach trips, this eco-conscious and comfortable set combines function, fashion, and fun in one smart design.

3. Yolrky Baby Swimwear

Brand	Yolrky
Material composition	Nylon, polyurethane
Pattern	Floral
Color	Beige
Closure type	Zipper
Top style	Rashguard
Availed sizes	80 cm to 130 cm

Yolrky Baby Swimwear is a charming and functional all-in-one swimsuit designed for baby girls. It features a long-sleeve rash guard style with a lovely floral print, offering both sun protection and adorable looks. Made from a blend of nylon and polyurethane, this swimwear is stretchy and comfortable, making it ideal for active little ones during beach outings or swim lessons.

The back zipper allows for easy dressing, while the full-body coverage ensures the tummy stays protected—perfect for energetic or easily chilled children. Available in sizes from 80 to 130 cm, it also comes with a matching cap for complete sun safety. This set is a great choice for summer leisure, baby swimming, or poolside fun.

4. Lucky Kids Swimsuit

Brand	Lucky Kids
Material composition	Nylon, polyester
Care instructions	N/A
Color	Green, Orange
Closure type	Zipper
Top style	Rashguard
Availed sizes	80 cm to 130 cm

Lucky Kids Swimsuit is a fun and protective swimwear option designed for both boys and girls, featuring a vibrant dinosaur pattern and a matching hat. Made from a comfortable blend of nylon and polyurethane, this rash guard-style swimsuit offers UPF 50+ UV protection, helping to block harmful sun rays during outdoor play at the beach, pool, or park.

The fabric is moderately thick to protect delicate skin from scratches or chills when wet, making it perfect for nursery school water play or family outings. With a convenient front zipper and stretchy design, it’s easy to put on and take off. Available in sizes from 90 to 130 cm, this swimsuit is ideal for active children who love adventure but need reliable sun safety.

5. Regalo Baby Swimsuit

Brand	Regalo
Material composition	84% Polyester, 16% Elastane
Care instructions	Washing machine
Color	Little moon, Ridestar
Closure type	Zipper
Top style	Rashguard
Availed sizes	80 cm to 130 cm

Regalo Baby Swimsuit is a stylish and protective swimwear set that includes a long-sleeve rash guard top, matching bottoms, and a UV-blocking swim cap—perfect for sunny beach or pool days. Made from a stretchy blend of 84% polyester and 16% elastane, this swimsuit offers UPF 50+ protection and is designed to move with your child for all-day comfort.

The thoughtful design includes a zipper with a protective cover to avoid skin irritation, a high-neck collar for added sun defense, and an adjustable drawstring waistband for a secure fit. Breathable and quick-drying, this swimsuit is also machine washable for easy care. Ideal for babies and toddlers, it’s a great pick for parents who want both UV protection and fuss-free functionality.

6. Solcy Kids Swimsuit

Brand	Solcy
Material composition	80% Polyamide, 20% Spandex
Care instructions	Hand Wash Only
Color	Safari print, Vehicles, Flower, Dinosaur, Sea Creatures
Closure type	Zipper
Neck style	Turtle Neck
Availed sizes	80 cm to 130 cm

Solcy Kids Swimsuit is a feature-rich 3-piece swimwear set designed to offer both fun and full-body sun protection. Made from a durable and stretchy blend of 80% polyamide and 20% spandex, it includes a long-sleeve rash guard, adjustable swim cap, and inner-lined pants—all crafted for comfort and UV safety. The high-density fabric is not only soft on the skin but also helps resist sand from getting trapped, making it perfect for beach play.

With UPF 50+ protection, long sleeves, and a flap-equipped cap, this swimsuit offers comprehensive coverage against harmful UV rays. Thoughtful extras like the anti-curling snap buttons, adjustable waistband, front zipper with skin-safe lining, and name tag space make it ideal for active summer outings and group activities. A practical and playful choice for boys who love the water and need reliable protection all day long.

Buying Guide: How to Choose the Best Swimwear for Kids in Japan

When selecting swimwear for your child, comfort, protection, and durability are key. Here are some important factors to consider:

1. UV Protection (UPF Rating)

Look for swimsuits with a UPF (Ultraviolet Protection Factor) of 50+, which blocks over 98% of harmful UV rays. This is essential for long beach days or outdoor water play under Japan’s summer sun.

2. Material & Breathability

Opt for swimwear made of polyester, nylon, or spandex blends, which offer stretch, quick drying, and breathability. These materials also retain shape well and provide flexibility for active children.

3. Coverage & Design

Rash guard-style swimsuits with long sleeves and high necks provide extra sun protection. Choose sets with swim caps and inner pants for added comfort and modesty. Fun patterns (dinosaurs, animals, floral prints) make the outfit enjoyable to wear.

4. Fit and Size Options

Japanese swimwear sizes are usually marked in centimeters, so match the height of your child for a better fit (e.g., 100 cm = approx. 3–4 years). Look for options with adjustable waists or drawstrings for growing kids.

5. Ease of Use

Zipper closures, especially on the front or back, make it easy to take on and off—even when wet. Snap buttons and two-piece sets are great for hassle-free diaper or toilet changes.

Frequently Asked Questions (FAQs)

Q1: What does UPF 50+ mean in kids’ swimwear?
A: UPF 50+ means the fabric blocks 98% or more of the sun’s harmful UV radiation, offering excellent protection for your child’s sensitive skin.

Q2: Is it better to buy a one-piece or two-piece swimsuit for kids?
A: Both have benefits. One-piece suits (like all-in-one rash guards) offer full coverage and fewer chances of fabric slipping. Two-piece sets are easier for diaper or bathroom breaks and allow for more flexible sizing.

Q3: Can my child wear swimwear for both pool and beach activities?
A: Yes! Most kids’ swimwear featured here is versatile and water-resistant, suitable for the pool, beach, or even water parks. Some even include sand-resistant fabric, perfect for beach play.

Q4: How should I wash and care for kids’ swimsuits?
A: Hand wash or use a laundry net on a gentle cycle. Avoid bleach and tumble drying. Always rinse with fresh water after swimming to remove chlorine or salt.

Q5: What size should I choose when buying swimwear from Amazon Japan?
A: Check the product’s size chart, typically in centimeters. Measure your child’s height for the most accurate fit, and consider sizing up if they are between sizes.

Conclusion

Choosing the right swimwear for your child makes all the difference for a fun and safe summer. Whether your little one loves dinosaurs, florals, or cool surfing prints, the options available in Japan combine style, comfort, and superior UV protection. With features like rash guards, inner pants, adjustable waists, and sun-shielding caps, these swimsuits are built to keep kids protected and parents worry-free. Invest in quality swimwear now so your child can make the most of every splash, dive, and beach day this season!

To read more reviews, you can go through our articles on best tablets for kids, best school bag for kids, best car seats for babies, or other baby products category on the Sakuron Japan website.

– Our editorial team reviewed this article and approved it for publication according to our editorial policy.

You can also check the Amazon bestseller list for best swimwear for kids:

Bestseller No. 1

[NexTrendy] キッズ水着 4点セット水着セパレート水泳ゴーグル水泳帽水着ボーイズ (110, ライトブルー)

上着（ラッシュガード）＋水泳パンツ＋スィムキャップ+水中ゴーグルのお得な4点セット！セットにする事で最適なコストパフォーマンスを実現！すぐにスイミングが始められます。上着ラッシュガードで紫外線カット。しっかり日焼け対策！
吸汗性・速乾性でサラッとした快適な着心地。伸縮性もあり動きやすい！上下セパレート着脱が楽にして頂け、トイレに便利です！肌にもさらっ心地よい着心地で乾きも速く長時間の着用でも快適に過ごせます。インナー無しでも大丈夫。
【水中ゴーグル+耳栓】ソフトなシリコンゴムで快適なフィット感。目の周りに密着し水が漏れにくく、長く使用しても圧迫感がありません。クリア色で目立たない「耳栓」と「専用ケース」付き。
【見た目もかっこいい！】シンプルながらスタイリッシュなデザインで子供にも人気です。速乾性に優れた水着素材なのでトレーニングウェアとしてもOK！アウトドアでの虫さされ防止、海でのクラゲよけにもお使いいただけます。プール、海水浴、スクール水着としてはもちろん、アウトドア、キャンプ、スポーツなど幅広く活躍します。

Bestseller No. 2

[chickiddos] キッズ水着男の子ラッシュガード長袖短パン+長ズボン上下3点セットアップ子供服ジュニア速乾グレースクール水着海遊び UVカット水泳速乾グレー 160

セット内容：長袖ラッシュガード+半ズボン+長レギンス　それぞれ分けても履きやすい一着です。　*男の子と女の子の短パンのデザインは異なります。
お子様のデリケートな肌を紫外線からしっかりと守ります。日焼けを防ぎ、安全に外での活動を楽しむことができます。
ファスナーのジャケットデザインは着脱しやすいで、便利です。長袖タイプは日焼け止めの役を立ちます。
海水浴、プール、ビーチ、温泉等場面によく使えるタイプですが、落ち着いた色柄で学校でも重宝するアイテムです。

Bestseller No. 3

[Teddy] キッズ水着男の子長袖ラッシュガード短パン水泳帽子 3点セット子供用紫外線対策 kids395 (B：ホワイト, 5T(100cm))

セット内容・3点セット・ラッシュガード・ハーフパンツ・スイムキャップ水着選びで迷わず楽にコーデ♪素敵な柄で楽しい夏の思い出に。小学生ジュニア男児上下セットアップかっこいい【商品詳細】・ジッパー：プラスチック・ウエスト調節：紐あり・金属パーツ：あり（アジャスター部分）・プラスチックパーツ：なし
Size 5T(100cm) 参考身長 95-105 着丈 42 身幅 29 ゆき丈 48 ウエスト 43-51 A：パンツ丈 31 B：パンツ丈 26 頭周り 44
point01紫外線からお肌を守る！ママも安心でHAPPY♪お子様のデリケートな素肌を日焼けからばっちりガード◎
point02お着替えもおトイレも楽々上下セパレート◎お着替えもおトイレも自分で出来ちゃう！？ママも楽らく♪

Bestseller No. 4

[Matreeglam] 水着子供女の子スカート水着タンキニ半袖キッズ水泳着女児小学生ジュニアスイムウェア子供用速乾素材紫外線対策 UVカット夏休み海ビーチ温泉旅行プール (JP, 身長, 140, 【短パンタイプ】ピンク)

【多彩なスタイルとサイズ】女の子用の水着セットには、「ショートパンツタイプ」と「スカートタイプ」の2種類が揃っており、好みに合わせて選ぶことができます。スカートタイプにはショートパンツが付いており、ファッション性と実用性を兼ね備えています。110cmから150cmまでのサイズ。サイズ表を参考に選んでください。
【高品質な素材】主素材は85%ポリエステルと15%スパンデックスを使用しており、柔らかく着やすく、軽くて快適です。肌触りがよく、通気性が高く、速乾性にも優れています。紫外線から肌を守り、下着が透けるのを防ぐことができます。また、日焼け止め機能も備えており、水着としてだけでなく、日焼け止めウェアとしても使えます。
【紫外線対応】UPF50+の日焼け止め機能を持つ素材を使用しているため、肌が敏感なお嬢様も安心して使用できます。水泳、サーフィン、ビーチウォーク、日光浴など、さまざまなシーンで紫外線からお子様の肌を守ります。首元にはジッパーが付いており、ジッパーの先端にはカバーが付いており、肌に触れることを防ぎます。
【ディテールと品質】細部にまでこだわり、素材選びから縫製まで、最高の品質を追求しました。丁寧な縫製で耐久性があり、型崩れしにくい設計です。多彩なカラーと柄デザインで、お子様のファッションニーズに応えます。パンツタイプもスカートタイプも、どちらも女の子らしいプリンセススタイルを演出し、水遊びを純粋に楽しむことができます。

Bestseller No. 5

[MIIFIT] 水着キッズ男の子子供用キッズ水着ウェットスーツ長袖ラッシュガードレギンスハーフパンツ上下セットセパレート紫外線対策日焼け止め水泳海水浴海遊び夏人気プレゼント6XL

素材構成: 82% ポリエステル, 18% ポリウレタン【セット内容】・3点セット水着・ラッシュガード・ハーフパンツ・レギンス三角形幾何学柄がクール、レギンスのロゴもカッコよさに磨きUp！水着選びで迷わず楽にコーデ、素敵な柄で楽しい夏の思い出に。小学生ジュニア男児上下セットアップかっこいい。
【紫外線対策】紫外線からお肌を守る！嬉しい長そで、長そででしっかり紫外線対策、お子様のデリケートな素肌を日焼けからばっちりガード。ビキニ焼けの心配なし、日焼け止めの節約にも。お肌の露出を抑えて水着の跡がくっきり残らないのが嬉しい、也可作为中暑对策使用！配有防雨罩和遮阳罩、您可以更加享受大海和游泳池！
【ウエスト調節】お着替えもおトイレも楽々上下セパレート、お着替えもおトイレも自分で出来ちゃう！お洋服感覚でお着替え！シャツのように上からすぽっと被るだけ！一人でも着替えやすい。
【適用場合】アウター&レギンスつきのフルセットが嬉しい可愛くてオシャレなキッズ水着の登場！カラバリ豊富でお友達や家族とお揃いコーデも楽しめます。　買ってすぐ使えるすぐにフルセットで色々買い揃えたりする手間がないのが嬉しい！海やプールだけでなく、水辺での遊び、レジャーなど様々なシーンで活躍間違いなし！　長袖アウター＆レギンスで怪我防止＆日焼け防止になるので、外で遊ぶお子様にピッタリ！全部着用するのも良し、レギンスなしでカジュアルに着てみたり男の子はショートパンツのみの着用でも着て頂けるので着こなし＆着回し自由自在！　飽きがこないシンプルデザインなので遊びだけでなく、水泳教室やレッスンの場にも最適です。しっかりした生地感で、水陸両用なのも嬉しいポイント！　ストレスフリーなノンワイヤーなのでアクティブなシーンでも動きやすく快適です。　全タイプ、男女問わず着て頂けるので、是非お好みのカラーを選んで下さい！

Bestseller No. 6