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

Loads of gin

10/29/2017 by Frances

My grandchildren love the pool watermelon. It sinks to the bottom when thrown and no telling where it will come up, Hours of fun



9/18/2017 by Patricia

A gift to my son inlaw
They have a pool and the family are enjoying the ball. Having a great time with family even my daughter is having fun


Really works

9/5/2017 by Christine

I bought this for my three grandsons to use in their pool. It was great fun. They passed and dribbled underwater for basketball. Had a lot of fun. Glad I bought it.More > < Less


As advertised

9/3/2017 by Dwight

The watermelon Ball is a lot fun in the pool


Excellent for play and teaching

9/1/2017 by Carole

A couple of years ago some of my children and nieces and nephews tried to make a neutral buoyancy toy with a pill bottle and a dime and an engineer cousin. He could explain it but we couldn't make it. This Watermelon ball was a fantastic solution. I bought three; one for each middle school family and took them to out family beach outing. WE had fun with them.More > < Less

Items 21 to 25 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.