There are three notable height categories for heels: high heel
(over 70mm), low heel (up to 40mm) and medium heel (between 40mm-70mm).
High heels are categorised into a number of styles. The most popular
style of high heel must be the stiletto, which is a slender heel
which is over two inches in height. Some other well known styles
of high heel include: cone, kitten, platform, prism, pump, puppy,
spool, and the wedge.