Size
Size 4: Men and U15 boys (13, 14, and 15 years old). Caution: the age categories may differ between countries.
Circumference / weight
65-67 cm / 410 grams.
Circumference and weight that meet the FINA regulations (International Swimming Federation).
Design
MAINTAINING OPTIMAL PRESSURE: Longer time between inflations thanks to the 80% butyl bladder. Butyl is the most airtight rubber.
IMPROVED GRIP IN WATER:
Our ball has had two upgrades compared to the WP500 ball:
- wider channels for better grip.
A rubber component with improved grip, called "soft tacky".