A water polo ball is not the same as a volleyball, and using the wrong ball for water polo makes the game frustrating for everyone. Water polo balls are designed with a textured grip surface that works when your hands are wet, and they come in specific sizes depending on the level of play. The best water polo ball for you depends on whether you are playing competitively, recreationally, or introducing kids to the sport.
This guide covers the best water polo balls for 2026 across regulation and recreational categories. If you are more interested in volleyball for the pool, check out our water volleyball balls guide and our breakdown of whether volleyballs are waterproof.
How We Evaluate Water Polo Balls
We test each ball in real pool conditions with players across different skill levels. We evaluate grip when wet, durability after repeated use, inflation retention, visibility in the water, and how the ball performs during passing, shooting, and one-handed handling. Regulation balls are also checked against official size and weight specifications.
Water Polo Ball Sizes Explained
Water polo uses different ball sizes depending on the level of play.
Size 5 (men’s): The standard men’s regulation ball. Circumference of 68-71 cm (about 27-28 inches). Weight of 400-450 grams (14-16 ounces). Used in men’s collegiate, club, and international competition.
Size 4 (women’s): The standard women’s regulation ball. Circumference of 65-67 cm (about 25.5-26.5 inches). Weight of 400-450 grams. Used in women’s collegiate, club, and international competition.
Size 3 (youth): A smaller ball for youth players (typically under 14). Circumference of approximately 62-63 cm. Lighter and easier to grip for smaller hands.
Mini/recreational: Non-regulation balls designed for casual play. They come in various sizes, often softer and easier to grip than regulation balls. Best for backyard pools and pickup games.
For casual water polo in your backyard pool, you do not need a regulation ball. But if you are practicing for competitive play, training with the correct size matters.
Best Water Polo Balls for 2026
1. Mikasa WP550C - Best Regulation Men’s Ball
The Mikasa WP550C is Mikasa’s official size 5 water polo game ball, built for official matches and serious league play.
What we like:
- Official size 5 game ball
- High-grip surface that stays secure when wet
- No-buff finish for a consistent surface and better durability
- Yellow, pink, and blue panels are easy to track
- Ships deflated
What could be better:
- Expensive for a single ball
- The grippy surface can be rough on unconditioned hands
- More ball than casual or recreational play needs
- Only a small number of owner reviews so far
Best for: Competitive male water polo players, high school and club teams, and anyone practicing with a game-quality size 5 ball.
2. Mikasa WP440C - Best Regulation Women’s Ball
The Mikasa WP440C is the size 4 companion to the WP550C. Same high-grip surface and no-buff finish, just sized for women’s play.
What we like:
- Size 4 for women’s play
- Same construction as the men’s WP550C
- High-grip surface for smaller hands
- Excellent wet grip
- Yellow, pink, and blue panels are easy to track
What could be better:
- Same high price as the men’s version
- Not necessary for recreational play
- Can feel too small for men or players with large hands
- Availability can be limited outside of specialty retailers
Best for: Competitive female water polo players and women’s teams at every level.
3. KAP7 Hydrogrip - Best Alternative Regulation Ball
KAP7 is a water polo specialty brand that has challenged Mikasa’s dominance with the HydroGrip series, and the size 5 HydroGrip is now the official NCAA men’s game ball. The water-reactant grip is different from Mikasa’s and some players prefer it, especially in very wet conditions.
What we like:
- Water-reactant HydroGrip surface, hand buffed for added grip
- Official NCAA men’s game ball, approved by NFHS and USA Water Polo
- Available in both size 4 and size 5
- Multiple color options to match your team
- Lower price than many game balls
What could be better:
- Grip texture wears with heavy use like any buffed ball
- Harder to find at general sporting goods retailers
Best for: Players who prefer a different grip texture than Mikasa, or teams looking for a competition-approved ball.
4. KAP7 Heavy Trainer Water Polo Ball - Best for Training
The KAP7 Heavy Trainer is an official size 5 ball weighted to 1 kg (2.2 pounds). It is made from the same material as the HydroGrip game ball and hand buffed for grip, but the extra weight turns passing and shooting drills into strength work.
What we like:
- Builds core strength, throwing power, balance, and coordination
- Same HydroGrip material and hand-buffed grip as the game ball
- Official size 5 dimensions
- A useful change of pace for practice sets
What could be better:
- Costs more than a standard game ball
- Not for games or scrimmages
- Too heavy for younger players or beginners
- Very few owner reviews so far
Best for: Players and teams who want to add strength work to practice. Use it for drills and save the regular game ball for scrimmages and matches.
5. Speedo Water Polo Ball - Best Recreational
The Speedo water polo ball bridges the gap between a real water polo ball and a pool toy. It has textured grip but is softer and more forgiving than regulation balls, making it ideal for casual play.
What we like:
- Softer construction is easier on hands
- Textured grip works well when wet
- Affordable price point
- Bright colors for visibility
- Good size for casual mixed-gender play
What could be better:
- Not regulation size or weight
- Grip wears down faster than competition balls
- Not suitable for competitive practice
- Lighter weight changes throwing mechanics
Best for: Backyard pool water polo, casual games at pool parties, and introducing new players to the sport without the sting of a regulation ball.
6. GoSports Water Polo Ball Set - Best Value Pack
The GoSports set includes 6 water polo balls in different colors, which is perfect for drills, team practices, and having multiple balls available for pickup games.
What we like:
- 6 balls at a lower per-ball cost than buying individually
- Different colors make drill organization easy
- Decent recreational-grade quality
- Includes a pump
- Good for large group pool games
What could be better:
- Not suitable for competitive play
- Grip quality is below training-grade balls
- Some balls in the set may inflate unevenly
- Colors can fade quickly in chlorinated water
Best for: Coaches running drills, families who play regularly, and anyone hosting water polo at events. Having 6 balls means less chasing and more playing. Works great alongside water volleyball equipment for a full day of pool sports, as covered in our water polo vs. water volleyball comparison.
How to Care for Your Water Polo Ball
Rinse after every use. Chlorine and salt water degrade rubber over time. A quick fresh water rinse after each session extends the ball’s life significantly.
Store deflated or slightly under-inflated. Storing a ball at full game pressure puts constant stress on the seams. Let some air out between sessions and re-inflate before play.
Keep out of direct sunlight. UV exposure dries out and cracks rubber. Store balls in a mesh bag in a shaded area, not sitting on the pool deck in the sun.
Check inflation regularly. Water polo balls lose air gradually. Check pressure before each session and inflate as needed. A properly inflated ball bounces and handles correctly. An under-inflated ball is harder to grip and throw accurately.
Replace when the grip wears smooth. Once the textured surface wears down, the ball becomes difficult to handle when wet. This is the primary sign that a water polo ball needs replacing. Game balls typically last 1-2 seasons of heavy use. Training balls may wear faster.
Browse all our water sports gear in the reviews hub.
Frequently Asked Questions
Can I use a volleyball for water polo?
You can, but it is a poor experience. Volleyballs are designed to be hit with flat hands and forearms. Water polo balls are designed to be gripped and thrown with one hand. A volleyball is too smooth to grip reliably when wet, too light to throw accurately, and the wrong shape for water polo passing and shooting mechanics.
What is the difference between a men’s and women’s water polo ball?
The primary difference is circumference: men’s balls (size 5) are 68-71 cm and women’s balls (size 4) are 65-67 cm. The weight is similar (400-450 grams for both). The smaller women’s ball is easier to grip with one hand for players with smaller hands, which is essential for water polo shooting technique.
How much does a good water polo ball cost?
Recreational balls cost $10-$25. Training balls cost $25-$50. Official game balls (Mikasa, KAP7) cost $60-$100 each. For casual backyard play, a $15-$25 recreational ball is perfectly fine. For competitive training, invest in at least one or two game-quality balls.
How hard should I inflate a water polo ball?
Official game balls are inflated to 90-97 kPa (13-14 PSI). For recreational play, slightly under that pressure is fine and makes the ball softer on hands. Use a pressure gauge rather than guessing. Over-inflation can damage the seams and makes the ball uncomfortably hard.
Is water polo safe for casual pool play?
Casual water polo is safe and fun with some modifications. Use a softer recreational ball, play in chest-deep water so everyone can stand, eliminate physical contact rules (no grabbing or pushing), and set up boundaries with pool noodles or lane lines. Keep the game friendly and focus on passing rather than aggressive play.
What age can kids start playing water polo?
Most water polo programs start at age 8-10, but casual pool play can begin earlier as long as children are confident swimmers. Use a size 3 or mini ball for younger players, play in shallow enough water for everyone to stand, and focus on throwing, catching, and basic passing rather than competitive rules.
