The cover is a pearlized resin but with a twist. A new flip additive is being used, and it has proven to be quite an addition to our already dynamic resin technology. We wrapped this super cover around the already proven and popular Yeti core creating a sharper transition resulting in more backend reaction than the preceding Yeti balls. The Yeti Uncaged will match up well on most medium lane patterns, and it will provide exceptional ball motion when playing a deeper inside line. Of course, the patented scoop core concept provides a wide range of drill patterns to match nearly all bowling styles.