seat material

you can use almost anything you want really.
there is covers called gripper.
one guy on another site makes seat covers, he used a lot of material.

just get something that is waterproof. that is really all you have to worry about.
 
Do a search on egay..the seats are stitched already to fit the blaster pan & foam to save you time, at least take a look to see what material types are out there.