Upgrade your ER seats. Included are two identical cushions with coated nylon outer shells & Thermarest inserts. Both cushions are strapped behind hinge area. Assorted colors. Price for two pieces so you use one for a back rest and one for seat.
If you have bucket seats just drill two 1.25" holes in lower seat area corners and use them to attach the webbing to the back. Also prevents water pooling on seat!