UNDERFOOT CUSHIONING SYSTEMS
shoe’s midsole itself is one of the primary
shock absorbing systems. Most running shoe
midsoles are made of EVA, but some include
substances such as rubber or polyurethane
(for greater durability and for heavier runners).
EVA (Ethyl Vinyl Acetate) is available in differ-
ent durometer ratings, making it either easier
or harder to compress. One of the more popu-
lar EVA compounds that shoe companies have
adopted in the last few years is to blend rubber
with EVA, creating a midsole that is a little
more durable than regular EVA, to give better
energy return.
Mechanical forms of cushioning or “systems”
in running shoes are also very popular in the
marketplace.
their customer choose the best technology for
their style of running and to help address any
problems they are having. Knowledge of the
various over the counter inserts is where you
can really shine. There are a dizzying array on
the market and your customer will appreciate
you being able to present the ones that will
work best for them, along with information
about why those are the best options.
In short, keep current with the newest technology
and utilize your knowledge to help your clients sort
through the options and you will be developing a
relationship that makes them customers for life!
PFA
In discussing underfoot materials and interac-
tions we must also consider the shoe socklin-
er/insert as another means of cushioning. The
manufacturer’s factory shoe inserts are usually
very basic. The reason for this is two-fold:
firstly, it's to reduce the cost of a new shoe in
production and secondly, the shoe companies
are well aware of the custom and sophisticated
OTC (Over-the-counter) after-market orthotic
business. Some companies, such as New Bal-
ance offer a separate range of OTC inserts, but
generally the shoe companies have little inter-
est in competing in the specialized over the
counter orthotics arena. Usually, the new shoe
insert is a simple pre-molded single density
EVA material, but some companies provide a
better-quality insert in their high end premium
shoes.
By keeping current with the various technolo-
gies offered by these manufacturers, even
ones you don’t carry, the pedorthist can help
Current Pedorthics | July/August 2018
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