The Trekker website describes this saddle the best! Some key details pulled from the site are below (http://www.trekkerflexiblesaddles.com/trekker-luxus-ultimate-luxury.html) -- this particular saddle is in great condition, comes with endurance stirrups, and Wintec leathers.
Developed in co-operation with veterinary surgeons, physiotherapists and experienced endurance riders The Trekker Luxus is a fully adaptable treeless saddle, having individually adjustable panels, seat sizes and fully adjustable pommel width to co-ordinate perfectly with the most diverse horses.
This saddle is totally flexible between the pommel and cantle and will adapt perfectly to the contour of the horse's back under the rider's weight. The underside has thick, adjustable panels which are secured by wide Velcro strips. The specially constructed adjustable pommel allows the width of the saddle to be easily adjusted from a narrow to x wide fit.
Adjustable pommel width (19.5–41cm)
Adjustable seat size (16–18")
Here are some of the superb features found on the Trekker Luxus: