An insole for use with footwear includes a first layer including a heel portion
of a first thickness, a mid portion connected to a front section of the heel portion
and having a substantially constant thickness which is much less than the first
thickness, and having an upward curvature, an upper surface extending along the
mid and heel portions and on which a person stands, and a lower surface extending
along the mid and heel portions, the lower surface including a shallow recess in
the mid portion, the first layer being made of a material of a first hardness;
and a flexible and resilient, thin arch spring insert of a substantially constant
thickness secured in the recess and following the curvature of the mid portion,
the arch spring insert being made of a material of a second hardness which is greater
than the first hardness.
