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)

Sorted by Rating

Fun item

7/25/2018 by Elaine

I bought this for my son's pool in Florida, the family really enjoyed it but over time it lost buoyance and my son couldn't find the tool to reinflate it. It would be nice if somewhere in their website there was instructions on how to inflate without buying a replacement toolMore > < Less


Works great

7/25/2018 by Karissa

Works just like it was intended to. Bounces great under water. I’ve used it as a medicine like ball in the water for workouts too. It was smaller than I imagined. I’ve played watermelon ball with a large watermelon not a personal sized one so at first I was disappointed but I suppose if you’re used to the personal size it’s not that far offMore > < Less


Fun in the pool!

5/16/2018 by Wendy

I’m still gettting the buoyancy down but we’ve had a lot of fun with this in the pool.


A fun product

8/22/2017 by Elana

I brought this to the beach and my family members enjoyed it - it has a different feel to it because of the weight that keeps it below the water line.
One fact worth knowing - you need a hose to fill it.
One question as yet unanswered - we drained it as much as possible at the end of our beach trip, but how will the water that remained inside affect its durability for next summer?
More > < Less


Cute pool toy!

8/15/2017 by Carol

My 13 year old granddaughter loves it. She is a fish in the pool and the Watermelon enables her to perform her underwater gymnastics.

Items 46 to 50 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.