[SoCalEDC]

if you google "inflatable kayak seat cushion" you may find an option that works for you. I have one inflatable crack of dawn seat (couldn't find it on the website but saw similar ones with a quick google search), that has some type of vinyl exterior so it doesn't adsorb water, and a foam interior as well as what im assuming are some air bladders inside. It can be inflated/deflated through an orifice in the bottom of the seat, however, because there is foam in it, it never goes to completely 0 cushion, so even if you were to penetrate the bladders with a hook or something like that, it still offers plenty of comfort over the traditional style seat.

Additionally it ties onto the existing seat straps at the rear, so i sometimes flip it up so that I can have the cushioning against my lower back rather than under my butt.