Here's a top view that I grabbed with the phone at work this evening.
From the seat they typically sell, I asked them to level out the rider area by removing some of the foam toward the back of that area. Then I asked the tech to shave down the raised area between the rider and passenger about 3/4". Finally, I asked him to take down the rim around the rider area to about half the original height, so there's less of a scooped out feel to it. The materials are leather on top and a vinyl on that sides that's called asphalt. I've had them do and entire seat in asphalt on an adventure bike. It makes a good gripper type material. The tuck 'n roll look to the top cover is an option. They can do it smooth too. But as many know, Corbin's foam is on the stiff side. When they do the tuck 'n roll, they stitch in an extra layer of soft foam. I don't know if they'll custom build a seat for mail order.