I did a trip a few years ago on a klr650, and got the airhawk air seat, which was super comfy, then had a black sheepskin trimmed down with some scissors (skin bought online for about $25 US I think) and fashioned into a seat cover at a leather tailor's in california (I took the bike with me and just explained what I wanted -they loved the idea), and put it OVER the airhawk . The two together were a winning combination

The skin just slipped on and off by the front part of the seat (the shop had made a tight fitting sheath out of the front part of the skin and some other durable material, and then they'd put 2 velcro points at the back (I attached small strips of opposing velcro to the back of the OEM seat, screwed into the underside of it and only just protruding from the sides)

The airhawk has elastic to hold it in place - i only used the front anchor point, which similar to the description above, slides between the metal of your tank and the front part of your seat, hugging the seat.

The airhawk is far more effective for me than a sheepskin for adding comfort, but the sheepskin made my bike look like an animal (I even left the hair a little longer down the middle strip when I trimmed it - like a beast's ridgeback); it probably added more comfort too, but I mainly like the way it held in place the airhawk, and looked tidy.

...................Just noticed the date of your post! Ah well.. For future info