I work on concrete floors wearing steel toe shoes for 12 hrs at a stretch and am on my feet the majority of the time .
I contacted The Insole Store and described my personal stats, weight, foot arch type etc and asked for their recommendation. This is the Sof Sole Airr Orthotics they recommended. I checked out their recommendation as well as some of the other items on the site and asked their opinions. The rep I was dealing with stuck with the Airr Orthotics even though some of my other comparison choices were either more or less expensive.
After wearing these insoles for 4 straight shifts (50+hrs total) I can say they are everything the rep said they were. It took a day or so for the insole to adapt to my foot shape but they are fine now. I would wholeheartedly recommend this site, The Insole Store.com, and the sof sole airr orthotic insoles to others.