Take two colors, swirl them together. One of the colors is a pure solid resin, the other color has mica added to pearlize it. Once you have the two swirled together, approximately 50% of the time the ball will be tracking over the solid coverstock, while the other 50% of the time it will be tracking over the pearl coverstock. That's the idea behind a hybrid. For example, the Storm Hy-Road will give you an in-between reaction of what you would get with the T-Road Solid or the T-Road Pearl simply because it has the hybrid coverstock over the same core. It will handle more oil than the pearl, but get through the fronts cleaner and rev up harder downlane than the solid.