From FP:

• Compatible with all foot types
• Best for mid to high arch
• 10 mm thick heel –> 5mm toe|  offers the most heel protection in any of our insoles
• Absorbs 91% of impact energy in lab testing compared to 53% in other “performance” insoles (ASTM F 1614 -1999)
• Our proprietary material in the exact same formulation is used by NASA on the ISS for sensitive electronics protection