There are many kinds of them for foot drop that you can get on-line or I believe over the counter. Here is just an example.

http://www.x-strap.com/

However, if you get an actual AFO (Ankle Foot Orthoses) you have to go thru an orthotist. That has to be fit to your needs. There are many kinds of those as well.

Could you post what he is talking about? Thanks much.