Superfeet outlast cork insoles.
They basically shove cork into an oven, it gets all soft, you sit on a chair, they put the footbed with the cork under it on your feet inside of a plastic bag, then they vacuum form it to your foot. It cools while being molded to you, then becomes rigid. Rigid isn't bad though, because it is formed to your foot. My footbeds would probably be uncomfortable to someone else, and vice-versa. The foam footbed on top of the cork also compacts a little when its hot, so I have full custom arch support, and at the toes, you can tell where the "knuckles" of my toes are. It's rad.
They were like $110 at Larrys Boot Fitters in Boulder, CO.