The Recon hand warmer is pretty good overall but its best suited for mild to cold temps not extreme cold. The hand warmer has a moderate amount of insulation, which I like so you don't have a big puff ball hanging off your chest especially if your archery hunting. It does have a pouch to put in a hand warmer which will be key for using it in extreme cold situations. Overall its a must have to keep your hands warm if your are a archery hunter and don't like to wear gloves or thick gloves when its cold and you can keep your release in it to keep warm if you hunt with a handheld release.