Flip Flops are sandals that have a piece of material separating the big toe and second toe and then attached to the sole on the sides of the foot to secure the shoe. Flip Flops are typically made out of rubber or rubber-like materials.
About Heel:
A heel is the bottom, back part of a shoe or boot that provides elevation. The styling and construction of a heel may vary (i.e., stacked, stilletto, spiked, sculptured, kitten).