Another vote for the Exigent. Very light material, easy to pack in its own pouch and covers the whole bike and will work for hot pipes also. IMOP if you aren't going to cover the whole bike from the rain, why cover it at all, you can carry a towel to dry the seat.
I grabbed one at walmart, why not,,for yours you would need x-l
cheap, works, don 't say " HD, come steal me"
I bend my antennas over and catch them on the speaker pods
helps keep cover up.
used it tons this summer on trips
1/2 cover by day and a full cover at night when im on the road...the half is nice cause its quick and easy on and keeps the sun off the seat....el cheapo wallmarto's..only way to go