slingback
sling back |ˈsliNGbak | ▶noun a shoe held in place by a strap around the back of the ankle: [ as modifier ] : a pair of red slingback pumps.
sling |back |ˈslɪŋbak | ▶noun a shoe held in place by a strap around the ankle above the heel: [ as modifier ] : high-heeled slingback shoes.