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Complete Guide to RIF and SEV Index Baseballs

Originally conceived by Worth, Inc. (now owned by Rawlings), the Reduced Injury Factor (RIF) traces back to its pioneering work in polycore softball innovation for baseballs and softballs. The term Severity Index (SEV Index) emerged roughly at the time, invented by MacGregor sporting enterprise, referencing a similar construction approach for baseballs and softballs. RIF /…

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Threads Inside Baseballs

Wool was selected as the primary material for the baseball’s windings because its natural resiliency and “memory” allow it to compress when pressure is applied, then rapidly return to its original shape. This property makes it possible for the baseball to retain its perfect roundness despite being hit repeatedly during a game. A poly/cotton blend was…

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