I found this pad recently on Ebay. It is the western version of the Grandeur Pads. This has a round skirt which are all made to order.
This pad fits well under ANY western treeless saddle as Grandeur will make the pad to your specific saddle type.
It comes with its own cushion half pad which is removable. You can add your own inserts for extra spinal relief into it if you needed to.
These pads are now available in 18 different colours. They also have the option of square stitching or revision stitching.
The top can be fabric, sympanova or neoprene. The base can be either black or camel artifical wool, sympanova with an artificial wool or a leather section at the rear.
This was a good find as I feel the neoprene top will help with stability. It has been ridden in once so far under the Barefoot Arizona and fitted well.
Treeless Saddles and Bareback Pads 