Hi Maire,
I don't think it matters too much. The temperature in your boot shouldn't get anywhere near -40. If it does, then the last thing you'll be worrying about is what material your orthoses are made of. I've taken my own EVA devices to -30 and they didn't appear to be appreciably different to +30. If your chap is really worried, tell him to keep his orthoses in his boots when he has them on or in his sleeping bag when he has it on. He'll be fine. Failing that, 'phone the Royal Marines in Plymouth and ask someone in the Arctic and Mountain Warfare Cadre for advice - their insoles used to be plastazote and aluminium foil (HM Government was never renowned for spending too much on troops footwear).
Regards,
Steve
Stephen Urry PhD
Lecturer
School of Public Health
Queensland University of Technology
Brisbane
4059
Australia
CRICOS No 00213J
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