Most football isn’t played on a regulation field with referees in attendance. It’s played mostly in parks, fields, backyards, beaches, and pools. And if a standard football gets wet, it becomes more difficult to grip (which is why a dry ball is rotated in between plays during rainy NFL games). If you’ll be playing in or near water, do yourself and your friends a favor by getting a ball designed for throwing when wet. The textured surface makes throwing easier, and the game a lot more fun.