Ballet Pump with Extra Width:

Quoted from Savista Magazine-

"The Ellie has a EEEEE+ fitting to accommodate swollen or extra wide feet. It slips on easily and the stretchy top line adjusts gently for a comfy, secure fit.

Unusually for a ballet pump, this ‘wear-with-anything’ shoe is very supportive, and has a soft, airflow lining for foot freshness. Built for comfort as well as looks, the Ellie also has a cushioning, lightweight sole and a seam-free toe area to protect against rubbing."