Ghost makes an extremely nice pad, especially for the very reasonable price. Many people buy these for other saddles including BMSS, Freeform, and even treed saddles.
Bottom material options include sympanova (a soft rubber, easy to clean, breathable), black or white wool blend, and an amazing medicinal sheepskin.
Luxurious Merino wool saddle pads and numnahs perfect for everyday use or competition...
Wool can absorb up to 30% of its own weight in moisture and will therefore help keep your horse dry under saddle. It's also less likely to cause allergic skin reactions. These pads fit Ghost and Bua nicely.