A neck gaiter does one job: close the gap between your jacket collar and your chin, which is where heat leaves fastest.
Ours is knit from the same 16.5-micron merino as the rest of the range, so it sits soft against a jaw that is already cold and raw — and it keeps working after your breath has made it damp. Pull it up over the nose on the lift, drop it to a headband on the way down.