Mid-sole for shoes

A mid-sole for a shoe, the mid-sole comprising:

• a body on which there is a lower portion for joining to a tread and an upper portion for supporting an insole, wherein said upper portion comprises a plurality of elastically compressible protrusions that protrude toward an outside of said body from a bottom surface of said upper portion and wherein each protrusion, of the plurality of elastically compressible protrusions, has an end surface that is flat, so as to define with end surfaces of the other protrusions, of the plurality of elastically compressible protrusions, an external surface for resting the insole, the external surface having a first anatomical shape, wherein a height of each of the plurality of elastically compressible protrusions varies according to a second anatomical shape of the bottom surface in a region of the mid-sole of which each of the plurality of elastically compressible protrusions is a part, wherein top surfaces of the plurality of elastically compressible protrusions are disposed towards said upper portion, facing away from said lower portion, said top surfaces of the plurality of elastically compressible protrusions having a first angle of curvature in a forefoot region of the mid-sole that changes along a longitudinal axis of the mid-sole such that there is a second angle of curvature disposed towards a heel region of the mid-sole, wherein each of the plurality of elastically compressible protrusions is constituted by a stepped frustum-shaped raised portion configured to be disposed towards a foot, said elastically compressible protrusions having a respective quantity of steps that varies according to the position of the respective protrusions along the longitudinal axis of the mid-sole.