I use I think it was called good feet or something like that.. and they do help my posture.. and make my back feel good.. I wear them in my sneakers when working out and in my walking shoes..
I'm nert sure I completely understand yer question..but I can tell ya that I often ware SAS shoes ...which come with an insert...and based on that...I can tell ya...that thar alot more comfortable if yer on yer feet much!