I am vacationing in Beijing right now, but have no time to go shopping for seat cover. We have to go where our tour bus takes us. I use beadrider and I am very happy with it, except it adds about 10mm to the ride height. I'll order some mesh material to try it out. I'll look for the mesh on the scooters around here to see how it looks like. I must say one thing about the beadrider, it is hard, but I can ride all day (10 hours plus ) on it during 40C, and not get score butt later. I think the beads give extra support.
I insulated with aluminum foam sheet below the air box instead of above the air box. I think insulating below the airbox will keep the intake air cooler. Also the intake air temperature senser is in the airbox. it will sense hotter temperatures than actual from of the trapped hot air due to your insulating above the air box. The Air temperature senser will signal the computer to lean out the fuel/air mix. Not good for riding slow.
I made a sheet of insulation on the bike under the seats and wrapped around the sides. I didn't insulate the seats themself. It works for me. It stopped all the hot air from rising to the seat area. I'll take a pic of this sheet of insulation when I return home if this thread is still going.
In china we buy this kind of things from internet, they ship it to us. maybe you can not find seat cover in dealer, because it is too cheap to make money from you. wish you can find a seat cover with same material.
I did think of insulate below air box, but if I do anything wrong, it will do harm to my bike. for example, if I drop some screw, or forget to install something, or screw too loose too tight, or break something... I am sure I would not, but in case it happen, I'd rather insulate above air box. in fact you can treat it as below the tank. and the other reason is, my target is cool down the fuel tank, other original design are all ok to me.
Yes the Air temperature sensor is in the airbox, not above it, the wire and plug above it. wish the sensor will work ok, will see if it ok in next summer.