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).
About Nubuck:
This is a grain leather that has been slightly brushed on the surface to create a very fine velvet-like appearance. The texture of nubuck is finer than suede.
About Wedge Sandals:
Wedge Sandals are sandals that feature a triangular, wedge-shape heel that runs uniformly underneath the foot. This heel design can add height, but is often considered to be easier to walk in than other high heeled sandals. Wedge Sandals may have any variety of upper design or styling or colors.