Wool can be used although it is considerably heavier and will absorb moisture and lose a good amount of its insulating capability. Also, remember to keep your head warm with the same materials and use a polypro or silk glove liner. Take plenty of water in insulated carriers and some emergency high energy bars just in case you do have the dubious pleasure of an unplanned night out. Now for the ever controversial cellular phone. But these are not designed to work in the backcountry.
Cell phones work on line of site signal.
You can increase your chances of getting a call out by climbing to the top of a peak or ridge to make the call. The bottom line is don't rely on the phone, be smart and be prepared to get yourself out . Check our links page for guide services to learn more about winter techniques.