Aerodynamic design elements: built-in air holes, a finned or multi-finned tail, and overall aerodynamic shaping — these features help the ball travel farther and create the whistling sound in flight.
Shells are made from materials such as EVA, rubber, or TPU, while fill materials include foam, polyurethane, and latex. Different balls use various combinations of these shell and fill materials.
The listings target a range from youth to adult, with examples including "5 Years and Up," "6 Years and Up," and "Adult."
Some flying foam balls include molded or built-in hand grips to improve holding, throwing, and catching.
Several listings note the balls ship deflated; a ball pump is required to inflate them and the pump is not included.
Some listings mention limited warranties such as a 30 Day Limited Warranty and a 90 Day Limited Warranty for specific items.
