They are great, a buddy of mine has one, Milwakee tools makes a camo one. Just a fair warning, DONT RELY ON IT!!!!! He was up in his tree stand several miles from his truck when the battery died and he had no spare. He was practically hypothermic when he got to his truck and could barely get his keys out, (apparently...I wasnt there) It was his own fault as he thought he could dress lightly because he had it. So as an extra pieced of luxary, yes, as something to ensure you are warm, NO