All DERBYSTAR APS and TT footballs have been made from PU-materials and are therefore guaranteed PVC-free. Compared to PVC-balls, they are softer and can be played more accurately, with a more stable ball movement through the air and on the ground, including bouncing.
These features are also maintained at lower temperatures, where PVC-balls tend to become harder and loose performance.
Finally the PU-ball has a substantially longer life than a PVC-ball.

PU
Feels like leather
Remains soft
Limited wear, long durability
Very flexible
Low force required, better flight path

PVC
Feels like plastic
Becomes hard at lower temperatures
High level of wear, limited durability
Not flexible
Requires more force to kick