I need arch support. Cheapo insoles from wal-mart have helped some but I'm needing something better. I was just about to order a $35 pair from the place Keltic recommended but are they any better than the cheap ones? Will they fit in any pair of running shoes?

I'd like to get custom made ones but can you interchange shoes with them? Someone told me what he had would only fit 1 shoe. ever.

I'm confused. :?