Mine were based on a plaster cast of the bottom of my feet. I have plastic with foam over it, the foam stops just before my toes. Thankfully, they do help most of the time, although I have noticed that if I am going to be standing or walking for most of the day I do better wearing them in my boots rather than shoes with no ankle support. The one other thing I've noticed about my orthotics is that I now get a callus at the back of my heel where it slips a little. Sanding down the callus periodically seems to take care of that problem. I've had my orthotics for 1 year this month.
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Good luck with your new orthotics!
-- Shadopanther