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 Spring:
Spring is the transitional season between winter and summer. Spring is generally a mild season characterized by mild to warm temperatures and abundant rain. Spring occurs during March, April and May in the northern hemisphere; and during September, October and November in the Southern hemisphere.