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What is the Shoe Stability Index? How is it calculated?

April 26, 2017calculated index shoe stability

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What is the Shoe Stability Index? How is it calculated?

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The Shoe Stability Index (SSI) is a measurement of overall shoe stability, and allows the consumer to identify how different shoe models compare to one another in regard to their functionality. Running shoes in particular show a vast difference in the degrees of support that they offer, and the SSI is a quantified measurement of the support level of any given shoe. The SSI is calculated using a formula that weighs the TCI and VCI (indicators of midfoot and rearfoot shoe stability) equally, converts them into a single index, and normalizes them to (approximately) a 100 pt scale. Shoes with a higher SSI have relatively more stability, while shoes with a lower SSI have less stability.