The SLAZENGER Championship Hydroguard Tennis Ball (Pack of 3 Balls, Green) is an excellent all-court tennis ball that combines a first-rate core with proprietary Hydroguard water-resistant fabric technology.
The Championship Hydroguard maintains its playability in the rain for a longer period of time since it is up to 70% more water resistant than the closest comparable competitor's "water resistant" ball. This results in more time spent on the court and, regardless of the weather, better and more entertaining tennis matches. The ITF has certified the Slazenger Championship Hydroguard ball.