Saddle Fit

What are the two most important things a saddle should do?

Why is saddle weight more important than rider weight?

Why is saddle fit so important for the horse?

Why won't a mold or cast of my horse's back guarantee a perfect saddle fit?

How much can a saddle pad help with saddle fit?

Why is the Leson Security Blanket so good for saddle fit compared to other saddle pads?