The Gero Backstrap Sandal in Nut/Black from Ganter.
The Gero belongs to the GANTER AKTIV family. With their patented dynamic rocking action, GANTER AKTIV shoes allow especially active, natural walking. Anyone who wears these shoes will enjoy a stimulating and yet relaxed sensation of walking. With vegetable-tanned calfskin leather lining and removable cork footbed, Gero offers your feet true comfort. This shoe can be adjusted to fit any foot perfectly thanks to two straps with hook-and-loop fasteners.