YES wrote:
I haven't tried the Tai Chis. Are you talking about putting like a flat Spenco insole in them?
Just the Tai Chis on their own with no changes. They have natural rubber in both the sole and the insole. Natural runnber is very bouncy, much more so that carbon rubber or any synthetic rubber, and you really feel this when you run in them. They have zero heel lift. Buy a pair and try them on grass or track.