I have this about my saddle. I'm not finding the time to do endurance that's why I'm selling the saddle.
C Width Accommodates a wider backed horse, but still of the breed type . . . Just a thicker set. Used more on Arabs, Morgan's, and Tennessee Walkers.
The above trees work best on horses whose backs slope away from the spine. The following are for flatter backed horses.
CC Width Like the C tree, but better for horses that are flatter over the back and loin. Also good if horse is slightly sway backed or bunchy shouldered, or whose croup is higher than withers.