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.

51 Reviews (4.7 out of 5 Grommets)

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8/2/2018 by James

My two grandsons loved it.


Oh Boy!

7/25/2018 by Susan J

My grandson loves the water ball. Friends ask where he got it :)


Fun for the pool

7/20/2018 by Cheri

Easy to fill and manipulate as needed to get to neutral buoyancy. It’s fun to bounce and throw. We are enjoying it!


Amazing Pool Toy!

7/6/2018 by Robert

Grandkids and their friends love it! Most popular pool toy they own!


Kids loved it!

5/15/2018 by Jennifer

We gave it to a nephew, and he and his older sisters loved it. We take any available chance to sneak science into their world and a ball that 'floats'and can be kicked and thrown under water is unusual enough to make a great physics lesson for all of us. The additional exercise didn't hurt either.More > < Less

Items 11 to 15 of 51 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.