At the local walking store saw a product called "Ergomates". Saw them
again recently in the Acklands Grainger catalog. Basically it appears
to be a form of anti-fatigue mat that straps over your existing footwear.

http://www.ergosusa.com/html/ergomates.html

They have two models, the "commercial" in white, or the "industrial" in
black.

Anyone ever use these?

Chris