From the DK Saddlery website:
The Bond IIProven technology in a saddle that helps to maximize performance and comfort.Mono Flap -This single flap designed with the long outer thigh block allows the rider to have even more leg contact and support. This design also gives the saddle an even narrower twist which allows the women's leg to sit closer and quiet to the horses side.Extra-Deep Extreme-Forward Cantle - This new design supports the riders lower back and places the pelvis and femur in the correct position effortlessly. The result is the elimination of small tensions in the rider that may be blocking the horses movement, more effective aids and seat as well as reduced lower back pain.Double V Billeting System - This newly developed billeting system relieves any pressure of the saddle on the horses tricep muscle and provides more consistent pressure along the panels and the horses back. The double V billeting system free's the horses shoulder and allows for greater range of motion in the fore-limb while sitting more quietly on the horses back encouraging engagement of the hind quarters and lifting of the back.Extra Wide Panels - The wide panels provide a large weight bearing surface on the horses back. By distributing the weight of the rider as evenly as possible over a wide area it reduces the incidents of pressure points and allows the horses back to move more freely.