Originally Posted by フェデラー
The only difference between the two is the sole. The clay has the typical herringbone sole that is common amongst clay court shoes. I don't know whether or not they help you at all for sliding on hard courts (not that you should be, you should be graceful like Roger).
Just so people know, the hard court sole already has a lot of herringbone pattern going on. Just that the clay version has more of it.