Bi-annual foam rant

Salmo Bytes wrote:

Why not an addition to the boat biz? "If you want something done right,
you have to do it yourself."

God forbid. To make money selling fly tying materials to fly
shops you need to be organized and efficient, and you need high
volumn. I already miss out on the first two requirements.

What is the ultra-low-weight foam used for in the real world?

What sorts of tools are used to slice the buns of the normal closed cell
foam into the forms that are retailed? Maybe these are not appropriate
for the ultra-low-weight stuff?