We cannot advise you on the use of FRÍO® travel wallets in cold and freezing or other extreme conditions because tests in these conditions have not been carried out. Any testimonials we have received on the use of FRÍO® products in cold and freezing and other extreme temperatures are from individuals who have simply reported back on their use of the wallets in these conditions – we must point out that we have not recommended the product as safe to use in extreme temperatures or environments.
All we can say, is that the wallets have been used by professional mountaineers in extreme conditions, and they have said the FRIO® wallet prevented the insulin from freezing during their trips, please see the section "What Customers Say".
We would recommend that you consult the manufacturer of your medication for advice on insultaing it against freezing temperatures.