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How can you still ride seriously on anything but a leather saddle? Saddles are meant to be of leather, saddle implies leather, if it is not leather it cannot be saddle. You don't sit on a saddle, you are saddled in a saddle, as the leather saddles your bones. You sit on a seat, and if your bike is uncomfortable it may be because you are sitting on a seat on the place where a saddle should be needed.