I have been trying kayak seat pads and have gone through several lately.
This one is ok but kind of thin.
http://www.amazon.com/Skwoosh-X3104-.../dp/B000A3I7IY
This one is the worst I have ever used and the valve always seems to let out all the air rendering it useless during the day and also I don't like the way it feels when fully inflated.
http://www.sportchalet.com/product/3...FY6Ufgod-h0AiQ
This one is the cheapest and the best of the three to me. Cheap, comfortable, doesn't need to be inflated.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
What pads do you like to use?