Foam bead and sintered foam structure

A sintered foam structure formed from foam beads that are formed from a composition comprising:

• an ionomer comprising, in polymerized form, ethylene, an unsaturated acid comonomer,
• and, optionally, an acrylate comonomer,
• wherein the unsaturated acid comonomer is completely or partially neutralized with a neutralizing agent,
• wherein the ionomer has a melting point from 55° C. to 70° C.,
• wherein the sintered foam structure has:
• i) an Asker C hardness from 45 to 55;
• ii) a foam density from 0.130 g/cc to 0.280 g/cc;
• iii) a falling ball rebound from 55% to 65%;
• iv) an average stress at break from 0.55 MPa to 1.00 MPa;
• and
• v) a Type C Tear from 5.0 N/mm to 15 N/mm.