US Patent 7648434 Ball for ball game

The present invention provides a ball for ball games which has equivalent or increased cushioning properties when compared conventional balls. The ball for ball games of the present invention includes a bladder made of rubber or elastomer, and a foamed layer covering the outside of the bladder, in which a skin layer is provided on each surface sectionalized by partition portions extending from the surface of the foamed layer, the partitions having a lesser degree of expansion than the main portion of the surface which is sectionalized by the portions.