The seat measures 18" and the 2 flaps measure normal. The tree measures 4" from dot to dot.A world class saddle used by world class riders, and anyone else with aspirations! Amerigo saddles are created by Peter Menet for top level performance, with correct anatomical design based on equine bio-mechanics that protects the well being of your horse while producing an efficient seat. What ever the level of your sport, you and your horse can concentrate fully on your performance, with total balance and precision. Amerigo saddles are designed to influence a correct, relaxed seat position which allows the leg to naturally fall into it's correct position enabling the rider to ride without tension, while the riders weight is transmitted to the horse on those areas where it can carry it without being disturbed from its natural rhythm and balance, allowing the horse to round his back and engage it's hindquarters more easily. Crafted from top materials including a variety of wooden spring trees and wool flocked independent Swiss style panels, Amerigo is one of the most correctly and easily fitted saddles, meeting the needs of both horse and rider.