There’s cold and then there’s Noorvik cold. In this far remote Alaskan town, the nighttime temperatures don’t budge above freezing for months on end – and the days aren’t a whole lot warmer. For conditions this chilled, we’ve engineered our warmest base layers. The densely knit poly/spandex fabric is smooth and slick on the outside, so it won’t bunch or bind under a flannel shirt or fleece jacket. The side that goes against your skin is plush, warm fleece with knit-in channels that trap body heat while reducing bulk. Plus it’s highly breathable, wicks sweat and fights stink. They even boast a pair of drop-in side pockets – the perfect place to stash your smartphone so the cold won’t kill its batteries.