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 Pull On Boots:
Pull On Boots are any styling of boot where the wearer puts on the boot by simply pulling the boot over the foot. Pull On Boots may have buckles or lacing as long as their purpose is for decoration only.