Neutrally Buoyant Water Ball

By Watermelon Ball

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For your next swimming pool game, toss around a Watermelon... Ball. Modeled after a real-life watermelon, this rubber ball can be dribbled, kicked, passed, and bounced—all under water. Fill it up with water and a little bit of air to make it neutrally buoyant—its density will match that of the surrounding water, so it doesn’t sink or float. Instead, it stays suspended in the H2O.

  • Materials: PVC/TBC, natural rubber
  • Neutrally buoyant when filled with water
  • Looks, feels, and behaves like a real watermelon in water
  • Passes up to 10 feet in water
  • Bounce against pool walls
  • Can be bounced, dribbled, kicked, and intercepted
  • Made in China
  • Dimensions: 3.94" x 8.07" diameter
  • Weight: 1.28 lbs.

55 Reviews (4.7 out of 5 Grommets)

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Great for basketball lovers

8/26/2018 by Carrie

My two boys (ages 12 and 10) love this pool toy! It can be dribbled like a basketball, and can be bounce-passed a surprisingly long ways under water.More > < Less


Good fun

8/12/2018 by James

Took a little bit to fill but have had lots of fun at the pool.


Big hit!

8/10/2018 by Judith

I bought this for my grandsons, ages 7 and 9, and they loved it!! Played for hours in the pool with it. The adults had great fun playing with it, too! Terrific product. Thanks!More > < Less


Fun in the pool!

8/9/2018 by Janice D

Wow - my great niece and nephew had a blast with this ball. They made up all kinds of games with it - kept them occupied for hours! In fact, time with it had to be divided up because they both wanted to be the boss of it!More > < Less



8/2/2018 by James

My two grandsons loved it.

Items 11 to 15 of 55 total

How come this ball won’t float or sink?

About Watermelon Ball


Up your swimming pool game with the Watermelon Ball.

We’ll explain. Apparently tossing around a real-life watermelon in water as entertainment is a thing. They behave differently than most air-filled balls, so you can actually dribble, kick, pass, and bounce them—all under water.

The reason for this behavior—not floating, not sinking, and sort of suspending itself mid-water—is that watermelons are made of 92% water. That makes them neutrally buoyant. But real watermelons also break and make a mess...

The Watermelon Ball is made of tough rubber. You can fill it up with water and just a little bit of air to get it at the right buoyancy. Throw it up to 10 feet under water and combine elements of football, basketball, and rugby for some unconventional aquatic entertainment. Or toss it around outside the water, too.

Turns out no part of the pool is off bounds with this summer game changer.