The newest offering from Aviar, the Rook 2.0, has a seat that is extra deep and close contact to your horse. The tree that has been minimalized to reduce weight and bulk. The Rook 2.0 sits you at the closest point to your horse/s back leaving nothing to interfere with you and your horse's connection. See last pic for stamp info!

Seat- 17.5"
Flap Length- 16.5"
Flap Width- 11.5"
Tree- 5"