Footwear, and methods of preparing same

The footwear sole according to claim wherein the composition consists essentially of:

• EVA copolymer in the range of 32% to 60% of the weight of the composition;
• rubber in the range of 25% to 60% of the weight of the composition;
• bulking agent in the range of 6% to 12% of the weight of the composition;
• foaming agent in the range of 0.5% to 12% of the weight of the composition;
• bridging agent in the range of 1% to 5% of the weight of the composition;
• and
• color master agent in the range of 0% to 2% of the weight of the composition.

A method of preparing a footwear sole comprising a unitary sole which includes a top-facing surface configured to support the surface of a foot and a bottom-facing surface configured to contact a ground surface, said top-facing surface having a plurality of surface regions comprising at least one arrangement of a plurality of surface structures selected from the group of:

• apertures and grooves, and said bottom-facing surface comprising an arrangement of a plurality of recessed grooves, said unitary sole being composed of a single unitary layer, the method comprising:
• forming, by mixing while heating, a molten composition comprising:
• ethylene vinyl acetate (EVA) copolymer in the range of 32% to 60%, rubber in the range of 25% to 66%, wherein said rubber is not an ethylene vinyl acetate copolymer, and at least one agent selected from a bulking agent and a foaming agent;
• inserting the molten composition to a mold;
• and
• forming the sole while curing the molten composition in the mold,
• wherein the footwear sole exhibits a density in the range of 0.2 to 0.45 mg per cubic millimeter, determined according to ASTM D297.