Heat moulded arch supports are designed to support your arches as they're meant to be supported and not re-invent the wheel, as our feet are so designed to walk on sand and soft surfaces. Hence why we have an arch on the souls of our feet and we're not designed to walk on tiles  wooden floors  bitumen or concrete and when we walk on these hard surfaces without proper arch support, our arches drop and over stretch and this leads to micro tears in the tendons in the arch of our feet and this in turn leads to a painful condition called Plantar Fasciitus. 
Heat moulded arch supports are the only permanent solution as they support the arch's in our feet 100% and this is the key to their success.