[Bloody Sam Roberts]

When the leather in the ball stretches, the pressure goes down!

Yes indeed. But what about the neoprene bladder that is within the outer leather skin? Is that affected by moisture?

[norwaypinesavage]

"what about the neoprene bladder that is within the outer leather skin? Is that affected by moisture?"

Moisture likely has little effect on the bladder. However, the bladder is there to hold the air in. I believe it provides little strength, compared with the leather.

[WayneS]

No, but it’s affected by the stretching of its leather casing.