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http://www.slazenger.com/tennis-balls/slazenger-championship-hydroguardtm.html
The combination of a first grade core with unique Hydroguard water resistant cloth technology has resulted in a truly remarkable all court tennis ball.
Up to 70% more water resistant than a standard ball, the Championship Hydroguard retains its playability in the wet for longer. This means more playing time on court.
ITF Approved
Hydroguard™
Technical Information Coming Soon.
Tour Core™