Originally Posted by pabloj
Don't know your weight but probably stiffness is not an issue for big guys.
i am on the heavier side
...but for me there is no existing rule. from my personal experience, shoes do not always feel the same, if this makes sense. and in the rare ocassions my feet do hurt or the soles start burning, it's 99% with a single sole.
also i have the the feeling the different toe spring of a double sole makes them more flexible. this may due, cause the majority of my shoes is custom made and are "balanced" for me.