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)

Sorted by Rating

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.


Great fun, could use a few tweaks

7/7/2017 by Lynne

This is a lot of fun and I'd recommend it to anyone. However, inserting the needle was a bit difficult due to the collapsed shape of the ball in the packaging. Also, while the watermelon coloring is ideal for a swimming pool, it's rather hard to spot in a natural body of water like a lake. An option of a brighter color, like a large lemon or orange, would make it much more visible. Just tonight we lost sight of our watermelon ball in the lake and had to give up the search. Hopefully it will be bobbing at the edge of the beach in the morning. If not, I'll be placing another order as soon as they come back in stock.More > < Less


Not as advertised

7/5/2017 by Fred

It didn't perform underwater as well as the one in the video. It floated to the surface too quickly, so it wouldn't stay under water as long as in the video. I submitted a question through Grommet as to why, but did not get an answer. We still had fun with it, just not as much as expected.More > < Less


It’s ok

9/17/2018 by Rita

Fun for older kids who swim well. Dangerous for little ones!!!


Did not work as previewed

7/13/2017 by Robert

Very heavy

Items 46 to 50 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.