On Mon, 23 Sep 2013 03:11:46 -0500, wrote in
Re What to use to prevent
stepping on nails:

This got me thinking and asking if there is any sort of shoe insert
manufactured that will prevent a nail from going into the foot?

Found some insoles here http://unequal.com/foot but it says
"fortified" with Kevlar. What does "fortified" really mean: 1%
Kevlar?
I wouldn't trust it much.

OTOH, here is a wholesaler of inserts:
http://www.alibaba.com/showroom/kevlar-insole.html
so someone must be using them. Note the above are Chinese wholesalers
so maybe you can get info about retailers from them by email.
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