I don't know, but I have tried several, including the old square canoe cushions, and am still afflicted with severe discomfort in my Poke boat (and in my butt, too), after only two hours or less. I happened to be in a medical supply place the other day and found a foam donut for those who have to sit all day (bummer!). I didn't buy it, of course, but it was only $14, so compares favorably with the gel seats I also haven't bought. If anyone has tried one of these donuts, how about some feedback? I would do it myself, but am currently painfully behind in my finances.
Pull-Up Strap Handle Kit
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