Abstract: A method of producing an anti-slip shoe sole makes use of a shoe sole forming die having a plurality of independent, projection-forming cavities in the bottom thereof. The cavities open to a reverse side of the die through respective escape holes connected to the cavities. A foamable, unvulcanized green rubber containing hard fibers dispersed therein is set in the shoe sole forming die. Heat and pressure are applied to the unvulcanized green rubber to cause the unvulcanized green rubber to fill the cavities and further to flow into the escape holes, thereby forming a shoe sole blank having projections integral therewith. Buffing is effected on the bottom portions of the projections, thereby allowing ends of the hard fibers to appear in the ground-contact surfaces of the projections.

Abstract: A composite rubber sheet material and a sport shoe including a composite rubber sheet material includes a sponge rubber sheet and a mesh cloth having a percentage of voids in the range of 15 to 75%. The mesh cloth is inset in one side surface of the sponge rubber sheet to a depth ranging from 5 to 75% of the thickness of the mesh cloth for enhancing the stability, durability, bendability and flexibility of the composite rubber sheet material.