. PRESTIGE X-D1 KThe mono flap version of the famous D1 dressage saddle is for riders who require even more contact with the horse, by maintaining the same action on the horse shoulders as in D1 saddle. The Zero versions are different from the previous model because it offers now a narrower twist to the rider. This has been possible by working on the following three points: The saddle tree is now thinner in the middle, the upper part of the flaps is now in calfskin