Be Careful With the Power Packs
Overally, these kept my feet pretty warm. They take a few minutes to get to a noticeably warm temperature, but they do. For context, I'm using these in -10F+ weather with -20F+ windchill. It's hard to fight the cold, so I give them credit for that.<br /><br />My only complaint is that the Velcro isn't long enough to go around a human calf, and tucking it into your boot is uncomfortable. The power switch is also too easy to turn on and off, so expect the batteries to drain faster.
Rating: 3 stars