A slingback strap is distinguishable from an ankle-strap in that the latter is a strap that completely encircles the ankle.
Preferably the socks are unseen when worn with mules or slingback shoes.
Slingback shoes are a good choice for summer as they can be adjusted during the day.
Sylvia was pacing the room, her slingback sandals flapping against her heels with every step.
She went to court in a tight white dress and gold slingback heels.