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“The durometer cannot be too hard,” Sachee said, referring to a device that measures a material’s hardness.

Each model features Ping’s multilevel, dual durometer face insert with variable depth and pitch grooves for consistent roll.

To find out, the authors quantified the mechanical properties of foot soles using a device called a Shore durometer.

The firmer durometer is designed to work better with the grip pressure usually associated with higher swing speeds.

The samples varied by durometer, a measure of the level of squishiness.