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 Moon Boots:
Moon Boots are high top footwear that resembles the boots worn by astronauts during their first Apollo missions to the moon. Intended to be worn in cold weather, Moon Boots are mostly made of lightweight insulating materials and have a thick and bulky appearance.