The Uno is HH's flagship model. It combines the adjustability for the horse of...
 
leather tree
adjustable panel (can choose the panel shape, length and width you and your horse need)
four billet positions
 
With adjustability for the rider...
 
two iron bar positions
ability to add material under the seat cover for different feelings of the waist/twist
a Spanish style seat that allows for more freedom of seat and leg position
 
The Uno comes with a fleece seat cover (synthetic), a suede seat cover (black by default, other colors available at request), panels (the style, length and width needed for you and your horse), and a fleece saddle cover.
The Uno is measured in spanish/baroque measurements...
 
A 13" spanish is roughly a 15" western which is roughly a 17" english
A 14" spanish is roughly a 16" western which is roughly an 18" english.
 
https://youtu.be/hc-XOtoRSVY?si=2k3U1M7RiIyzZUD5