I've had these mitts out BC & Alpine skiing, digging test pits and even watching ski-joring in the Big Hole. For me (with cold hands), they are good to about zero F in the pit. While they are the warmest mitt I've owned, I'm withholding a star due to lack of nose wipe patch. Military mitts have had nose wipes at least since the 50's, why don't these have them? The glove inside the mitten shell works but don't count on the glove lasting a long time without the excellent shell protecting it - very light nylon. Overall nice gear.