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The Cavallin Pioneer model is a combination of the Heritage and Crusader, but with the saddle flap moved back 1.5".
This allows riders who have shorter legs to use the the rear stirrup ring (for a straighter leg position). This worked great for my mare who dislikes moving legs - excellent stability!
The innovation to distribute weight through the flaps across the length of the saddle was made by Torsion (also designed by Camillo Cavallin) years ago and popularized in the US and Canada through Sensation saddles.