Extra socks can be used for more than keeping your toes toasty.
Level of difficulty (1 being easiest, 10 being hardest): 1
Clean water and warm feet are both very important in the wilderness. An extra pair of socks can be used to filter murky water, and used to keep your feet dry and warm. If you switch socks, be sure to keep your old pair outside of your pack so they will dry quickly and be ready when you need them.