Raising an inflatable seat?

[StacyR]

My pontoon is frameless and has a very comfortable inflatable seat. It relies on the tautness of the bladders to keep your butt from dragging. Normally it's fine, except when the temperature changes suddenly. I was out fishing a pond last night when we had a storm come up just as the sun went down. The temperature dropped like 15 degrees and with the sun no longer shining on the fabric, the tubes and seat both shrank to the point where water seeped into the wet storage area behind the seat and my butt got wet.

I was wondering if there was a way to raise or stiffen the seat? The seat bladder slides into a pocket sewn into the (non-inflated) floor.

Fortunately catching some bull gills on my hand-tied jigs made it worthwhile.
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