I've got a Surf to Summit seat that fits the description you gave. It's terrific. There's not much padding for your bum, but the lower back support is nice to have, it gives you something to push against to lock in better when in swift water, I use the rod holders on it, and the pouch on the back of the seat is convenient for putting a small dry box with my wallet, keys, and phone into. While I don't know your precise expectations, the seat met my expectations and has proven to be more durable than I expected as well.
- Big D