Okay couple of ways to go here. In expensive or expensive
Inexpensive... purchase LD Comfort underwear. No seams makes your seat time a lot nicer about $65.00
Buy a Alaskan Butt Pad (Sheepskin) Cool in Summer , warm in Winter. About $50.
Air Hawk cushion $85
Corbin seat about $370.00
I have a Corbin. Used it for six months sent it back with instructions on what I want modded. First year mods free. Seat now perfect could do a thousand on her if needed.
One other thing..nothing beats seat time to harden the ole butt
Hope this helps.