Foam compositions and uses thereof

A thermoplastic elastomeric foam midsole for an article of footwear, wherein the thermoplastic elastomeric foam midsole is produced by the method comprising:

• forming a single phase solution of a blowing agent dissolved in a molten polymeric material comprising a thermoplastic elastomer, wherein the thermoplastic elastomer does not include a thermoplastic polyurethane, and the molten polymeric material does not include ethylene-vinyl acetate copolymer;
• injecting the single phase solution into a mold cavity, wherein the mold cavity is configured to mold a midsole for an article of footwear;
• physically foaming the single phase solution in the mold cavity, thereby forming a foamed molten polymeric material;
• solidifying the foamed molten polymeric material in the mold cavity, thereby forming a foam midsole having a multicellular foam structure, wherein the foam is a thermoplastic elastomeric foam that comprises a multicellular foam structure having a specific gravity less than 0.1, a split tear value greater than 1.0 kg/cm and an energy return greater than 400 mJ when determined using the Cyclic Compression test as described herein;
• and
• removing the foam midsole from the mold cavity.