Heel Saviours will double to triple the impact protection of stock insoles and increase impact protection to the max when placed under FP Insoles. Sloping from 6mm to 2mm, the Heel Saviours will fit in any shoe. A highly resilient skin protects the inner foam for lasting durability and protection from blowouts. Includes 2 Heel Saviors which you simply slip under your current insoles in your shoes.