Non-slip outsole

A slip resistant shoe sole assembly comprising:

• a shoe sole having a peripheral downwardly extending wall having a lower edge and defining a downwardly open cavity within said wall;
• said cavity having an upper surface and a peripheral wall surface;
• a tread insert layer having a peripheral edge with a configuration and size matching that of said peripheral wall surface, having an upper bonding surface, and having a lower slip resistant tread surface;
• said tread insert layer having a sheet-like construction with uniform thickness throughout, wherein said peripheral edge is formed generally perpendicular to said upper and lower surfaces thereof, and being fitted within said cavity with said upper insert surface bonded to said upper cavity surface, and said insert peripheral edge bonded to said peripheral wall;
• said shoe sole assembly having heel and toe regions;
• said cavity having a first depth less than the thickness of the tread insert layer and a second greater depth at the termini of said heel and toe regions, which second depth is equal to the thickness of said tread insert layer, whereby said tread insert lyaer at the termini of said heel and toe regions is flush with said peripheral wall lower edge at said heel and toe regions to thereby avoid torsional stress on said tread insert layer tending to break away the heel or toe region of said insert layer loose from said shoe sole assembly, and the remaining regions of said tread insert layer having a thickness greater than the depth of said cavity, to protrude downwardly beyond said cavity for slip resistant floor engagement.