Extra seat padding/cushion

I have one of these.

You can pick one of these up for $12-$20, and it is inflatable.  The strap can be wrapped around the back of the seat to hold it in place. 
On mine, I had my wife shorten the loop on one side so I could cinch it down tighter to the back of the seat.  It is amazingly comfortable for such a cheap price.

I got the same one from Amazon. It really makes a difference when your fishing for hours at a time.

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 Ha... I have that one too.  It's nice to be able to adjust the air to whats comfortable throughout the day. 
I would like to find or have my sister sew up (she has commercial machines) something about 4 inches thick.  That low ride is a killer on my back after peddling. Something out of closed cell foam with a butt dent..

I have a high back seat that doesn't have much padding on the bottom at all. So I attached a HotSeat pad to my seat. They are adhesive and after 3+ years of the pad being stuck to my seat, it has never moved or started to peel off. http://www.surftosummit.com/hot-seat-kayak-seat-mild-p-1682.html?cPath=283_209

I completely forgot about the Hotseat I put on my T-13.  It works, but I don't think it's as good as my inflatable seat from the Allen company.

So after my first outing in the yak, I've got to say that the Allen company inflatable seat was definitely worth the money.  For $15, my cheeks couldn't be happier at the end of the day.     Thanks for the suggestion INSAYN.

Now, I just got to find something to support my lower back.