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 Satin:
A shiny, woven fabric made of silk or rayon with a smooth, glossy finish and dull backing. Satin is often found on dyeable shoes, bridal shoes, and other formal footwear.