Footprint Kingfoam Elite Mid Classic Insoles. 7mm heel to 5mm toe. Fits in most shoes. Embossed skeleton logo bottom with tough skin. TPU layer under fabric for extreme durability. Absorbs 91% of impact energy in lab testing compared to 53% in other performance insoles (ASTM F 1614 -1999). Proprietary material is the exact same formulation used by NASA on the ISS for sensitive electronics protection.