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Table 1 Hardness of Insoles - SHORE 'A' Scale

From: Firm insoles effectively reduce hemolysis in runners during long distance running - a comparative study

Insoles Hardness
Sole - A* 44 - 49
Sole - D† 32 - 36
  1. * Sole - A categorized as firm insole
  2. † Sole - D categorized as soft soles