Hola! I am going to Spain for two weeks to play in a small academy that is on clay courts. Obviously, I need a pair of clay court shoes, and I'm wondering, what is the difference between clay shoes and hard court shoes? Is it just the outsole? I've looked at the very limited choices of clay court shoes and I don't know if I will like them. Also, are hard court shoes fine to play with on clay? Any suggestions would be much appreciated...thanks!