Make sure the patient is dry , and has a polypropylene layer to minimize sweating on the skin. The person must be protected from any moisture in the environment. Give a dilute mixture of warm water with sugar every 15 minutes. This will be absorbed directly into the blood stream providing the necessary calories to allow the person to re-warm themselves. Urination - people will have to urinate from cold dieresis.
Vasoconstriction creates greater volume pressure in the blood stream.
The kidneys pull off excess fluid to reduce the pressure. A full bladder is a place for additional heat loss so urinating will help conserve heat. You will need to help the person urinate. Open up the Hypothermia Wrap enough to do this and then cover them back up. You will need to keep them hydrated with the dilute Jells solution described above.