Gear Review: PHOOZY XP3 Phone Case
I have personally had my phone overheat several times while kayaking even though my phone was in a waterproof box. The exact same effect can happen during extremely cold conditions. It becomes a real problem if you are sitting in your treestand all day and cannot call a buddy to come help drag that big buck out because your phone has been dead for the six hours prior.
Enter the Phoozy XP3 series thermal capsule. Read more.