ECCO is a European shoe company founded in Denmark in 1963. Today they own and operate factories throughout Europe and Asia. They produce all the leather used in making Ecco shoes, taking measures to protect the environment at the same time. Their sole aim is to make a comfortable walking shoe. Ecco's Nioki imparts sleek, ankle-skimming style in smooth leather. Leather. Rubber sole. Shaft measures approximately 6" from arch. Heel measures approximately 2" Boot opening measures approximately 10" around. Flexible sole.