After years of pounding, your heel's natural cushioning fat pad flattens out, losing its shock-absorbing capability. The inflammation associated with plantar fasciitis can often lead to the formation of a heel spur ( which is a calcium deposit on the heel bone) that can cause severe pain with each step. These visco-elastic polymer heel cushions dissipate the shock impact of each step while a removable insert creates a soft ring of protection around your heel spur, providing instant relief for painful heels.Specify Men's/Women shoe size.