: I know people who
: have used those long floatable tubes (snakes) from toy stores for thigh
: braces. Those are Ethifoam. I purchased closed cell foam 1" thick at
: garden centers to kneel on.

I've also used "boogie boards" as a source for ethafoam. These are little surfboard like beach toys. Usually pretty cheap and in cool bright colors. Wouldn't pink and purple look good with your wooden kayak?